{"id":2419,"date":"2020-06-25T23:24:53","date_gmt":"2020-06-25T15:24:53","guid":{"rendered":"http:\/\/www.ponybai.com\/?p=2419"},"modified":"2020-06-25T23:24:53","modified_gmt":"2020-06-25T15:24:53","slug":"salesforce%e5%bc%80%e5%8f%91%e4%ba%ba%e5%91%98%e7%9a%84javascript%e6%8a%80%e8%83%bd-%e5%a4%84%e7%90%86%e5%af%b9%e8%b1%a1%ef%bc%8c%e7%b1%bb%e5%92%8c%e5%8e%9f%e5%9e%8b%e7%bb%a7%e6%89%bf","status":"publish","type":"post","link":"http:\/\/www.ponybai.com\/?p=2419","title":{"rendered":"Salesforce\u5f00\u53d1\u4eba\u5458\u7684JavaScript\u6280\u80fd-\u5904\u7406\u5bf9\u8c61\uff0c\u7c7b\u548c\u539f\u578b\u7ee7\u627f"},"content":{"rendered":"\n\t\t\t\t\n<h2 class=\"wp-block-heading\">\u5b66\u4e60\u76ee\u6807<\/h2>\n\n\n\n<p>\u5b8c\u6210\u672c\u5355\u5143\u540e\uff0c\u60a8\u5c06\u80fd\u591f\uff1a<\/p>\n\n\n\n<ul class=\"wp-block-list\"><li>\u4f7f\u7528\u5bf9\u8c61\u6587\u5b57\u7b26\u53f7\u548c\u6784\u9020\u51fd\u6570\u521b\u5efa\u5bf9\u8c61\u3002<\/li><li>\u5c06\u5c5e\u6027\u548c\u529f\u80fd\u5206\u914d\u7ed9\u5bf9\u8c61\u3002<\/li><li>\u786e\u5b9a\u539f\u578b\u5728JavaScript\u5bf9\u8c61\u7ee7\u627f\u4e2d\u7684\u4f5c\u7528\u3002<\/li><li>\u63cf\u8ff0JavaScript\u7c7b\u8bed\u6cd5\u3002<\/li><li>\u63cf\u8ff0\u95ea\u7535\u7f51\u7edc\u7ec4\u4ef6\u4e2d\u7ee7\u627f\u7684\u4f5c\u7528\u548c\u5bf9\u8c61\u6587\u5b57\u8868\u793a\u6cd5\u3002<\/li><\/ul>\n\n\n\n<p>\u6709\u5f88\u591a\u65b9\u6cd5\u53ef\u4ee5\u5c06JavaScript\u63cf\u8ff0\u4e3a\u4e00\u79cd\u8bed\u8a00\u3002\u65e0\u8bba\u60a8\u9009\u62e9\u54ea\u79cd\u5b9a\u4e49\uff0c\u6bcf\u4e2a\u4eba\u90fd\u53ef\u4ee5\u540c\u610f\u5bf9\u8c61\u7684JavaScript\u6982\u5ff5\u7684\u91cd\u8981\u6027\u3002\u60a8\u8d8a\u4e86\u89e3JavaScript\u5bf9\u8c61\u4ee5\u53ca\u5b83\u4eec\u5982\u4f55\u5de5\u4f5c\uff0c\u5c31\u8d8a\u80fd\u7f16\u5199\u6709\u6548\u7684JavaScript\u3002<\/p>\n\n\n\n<p>\u5728\u5f00\u59cb\u4e4b\u524d\uff0c\u8bf7\u5148\u5bf9\u5bf9\u8c61\u8fdb\u884c\u4e00\u4e9b\u8bf4\u660e\u3002&nbsp;<\/p>\n\n\n\n<ul class=\"wp-block-list\"><li>\u5bf9\u8c61\u6ca1\u6709Apex\uff0cJava\u6216C\uff03\u5f00\u53d1\u4eba\u5458\u53ef\u80fd\u4f1a\u60f3\u5230\u7684\u7c7b\u3002<\/li><li>\u6bcf\u4e2a\u5bf9\u8c61\u90fd\u7ee7\u627f\u81ea\u53e6\u4e00\u4e2a\u5bf9\u8c61\u3002<\/li><li>\u5bf9\u8c61\u662f\u53ef\u53d8\u7684\u3002<\/li><li>\u5bf9\u8c61\u5728\u521b\u5efa\u65f6\u4f1a\u83b7\u5f97\u81ea\u5df1\u7684\u53d8\u91cf\u4e0a\u4e0b\u6587\u3002<\/li><\/ul>\n\n\n\n<h2 class=\"wp-block-heading\"><a href=\"https:\/\/trailhead.salesforce.com\/content\/learn\/modules\/javascript-essentials-salesforce-developers\/work-with-obj-class-prototype#-----------creating-objects--\"><\/a>\u521b\u5efa\u5bf9\u8c61<\/h2>\n\n\n\n<p>\u4ece\u8bed\u6cd5\u4e0a\u8bb2\uff0c\u6709\u51e0\u79cd\u65b9\u6cd5\u53ef\u4ee5\u7528JavaScript\u521b\u5efa\u5bf9\u8c61\u3002\u4f46\u662f\uff0c\u65e0\u8bba\u60a8\u5982\u4f55\u521b\u5efa\u5bf9\u8c61\uff0c\u5b83\u5b9e\u9645\u4e0a\u90fd\u662f\u5728\u62bd\u8c61\u4e00\u4e2a\u79f0\u4e3a\u7684\u5e95\u5c42API&nbsp;<code>Object.create()<\/code>\u3002 &nbsp;<\/p>\n\n\n\n<p>\u5728\u67d0\u4e9b\u60c5\u51b5\u4e0b\uff0c\u6709\u5145\u5206\u7684\u7406\u7531<code>Object.create()<\/code>\u76f4\u63a5\u4f7f\u7528\uff0c\u4f46\u6211\u4eec\u4e0d\u5728\u6b64\u4ecb\u7ecd\u3002\u76f8\u53cd\uff0c\u8ba9\u6211\u4eec\u770b\u4e00\u4e0b\u521b\u5efa\u5bf9\u8c61\u7684\u66f4\u5e38\u89c1\u65b9\u6cd5\u3002&nbsp;<\/p>\n\n\n\n<p><strong>\u5bf9\u8c61\u6587\u5b57\u8868\u793a\u6cd5<\/strong><\/p>\n\n\n\n<p>\u7b2c\u4e00\u4e2a\u5bf9\u8c61\u521b\u5efa\u8bed\u6cd5\u79f0\u4e3a\u5bf9\u8c61\u6587\u5b57\u8868\u793a\u6cd5\u3002\u8fd9\u662f\u4e00\u6b21\u540c\u65f6\u58f0\u660e\u548c\u5206\u914d\u5bf9\u8c61\u7684\u7b80\u5355\u58f0\u660e\u65b9\u5f0f\u3002\u7136\u540e\u7acb\u5373\u5c06\u5bf9\u8c61\u5206\u914d\u4e3a\u540c\u4e00\u8bed\u53e5\u7684\u4e00\u90e8\u5206\u3002&nbsp;<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>const bike = {\n  gears: 10,\n  currentGear: 3,\n  changeGear: function(direction, changeBy) {\n    if (direction === 'up') {\n      this.currentGear += changeBy;\n    } else {\n      this.currentGear -= changeBy;\n    }\n  }\n}\nconsole.log(bike.gears); \/\/ 10\nconsole.log(bike.currentGear); \/\/3\nbike.changeGear('up', 1);\nconsole.log(bike.currentGear); \/\/4<\/code><\/pre>\n\n\n\n<p>\u5bf9\u8c61\u6587\u5b57\u7b26\u53f7\u672c\u8d28\u4e0a\u662f\u58f0\u660e\u6027\u7684\u3002<code>bike<\/code>\u6b64\u00a0\u793a\u4f8b\u4e2d\u7684\u5bf9\u8c61\u5177\u6709\u4e09\u4e2a\u6210\u5458\uff1a<code>gears<\/code>\u548c<code>currentGear<\/code>\u5c5e\u6027\u4ee5\u53ca<code>changeGear<\/code>\u51fd\u6570\u3002\u82e5\u8981\u5728\u521b\u5efa\u5bf9\u8c61\u540e\u5f15\u7528\u8fd9\u4e9b\u6210\u5458\uff0c\u8bf7\u4f7f\u7528\u70b9\u8868\u793a\u6cd5\u3002\u00a0<\/p>\n\n\n\n<h4 class=\"wp-block-heading\"><a href=\"https:\/\/trailhead.salesforce.com\/content\/learn\/modules\/javascript-essentials-salesforce-developers\/work-with-obj-class-prototype#note\"><\/a>\u6ce8\u610f<\/h4>\n\n\n\n<p>\u60a8\u53ef\u80fd\u4f1a\u6ce8\u610f\u5230JSON\u548c\u5bf9\u8c61\u6587\u5b57\u8868\u793a\u6cd5\u5f7c\u6b64\u76f8\u4f3c\uff0c\u4f46\u662f\u5b83\u4eec\u5e76\u4e0d\u76f8\u540c\u3002JSON\u662f\u4e00\u79cd\u6570\u636e\u4ea4\u6362\u683c\u5f0f\u3002\u5bf9\u8c61\u6587\u5b57\u7b26\u53f7\u662f\u4e00\u79cd\u7f16\u7a0b\u8bed\u6cd5\u3002\u4f46\u662f\uff0cJSON\u89c4\u8303\u57fa\u4e8e\u5bf9\u8c61\u6587\u5b57\u8868\u793a\u6cd5\uff0c\u56e0\u6b64\u5f88\u5bb9\u6613\u5c06\u4e24\u8005\u6df7\u4e3a\u4e00\u8c08\u3002<\/p>\n\n\n\n<p>\u6587\u5b57\u5bf9\u8c61\u975e\u5e38\u9002\u5408\u4e00\u6b21\u6027\u5bf9\u8c61\u3002\u4f46\u662f\uff0c\u5982\u679c\u8981\u521b\u5efa\u4e24\u4e2a\u6216\u66f4\u591a\u4e2a\u76f8\u540c\u7c7b\u578b\u7684\u5bf9\u8c61\uff0c\u5219\u5b83\u4eec\u662f\u4e0d\u5b9e\u9645\u7684\u3002\u4e3a\u6b64\uff0c\u60a8\u9700\u8981\u53ef\u91cd\u590d\u7684\u903b\u8f91\u6765\u521b\u5efa\u65b0\u5bf9\u8c61\u3002&nbsp;<\/p>\n\n\n\n<p><strong>\u6784\u9020\u51fd\u6570\u7684\u65b0\u5bf9\u8c61<\/strong><\/p>\n\n\n\n<p>\u521b\u5efa\u5bf9\u8c61\u7684\u53e6\u4e00\u79cd\u65b9\u6cd5\u662f\u4f7f\u7528\u6784\u9020\u51fd\u6570\u3002\u6784\u9020\u51fd\u6570\u662f\u4e00\u79cd\u51fd\u6570\uff0c\u5176\u4e2d\u5305\u542b\u7528\u4e8e\u5728\u521b\u5efa\u548c\u5206\u914d\u5bf9\u8c61\u65f6\u5efa\u7acb\u5bf9\u8c61\u5c5e\u6027\u7684\u6307\u4ee4\u3002\u4e0e\u5bf9\u8c61\u6587\u5b57\u76f8\u6bd4\uff0c\u8fd9\u5177\u6709\u4f18\u52bf\uff0c\u56e0\u4e3a\u60a8\u53ef\u4ee5\u521b\u5efa\u5177\u6709\u76f8\u540c\u5c5e\u6027\u7684\u5bf9\u8c61\u7684\u8bb8\u591a\u5b9e\u4f8b\u3002&nbsp;<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>function Bike(gears, startGear) {\n  this.gears = gears;\n  this.currentGear = startGear;\n}\nBike.prototype.changeGear = function(direction,changeBy){\n  if(direction === 'up') {\n    this.currentGear += changeBy;\n  } else {\n    this.currentGear -= changeBy;\n  }\n}\nconst bike = new Bike(10, 3);\nconsole.log(bike.gears); \/\/ 10\nconsole.log(bike.currentGear); \/\/3\nbike.changeGear('up', 1);\nconsole.log(bike.currentGear); \/\/4<\/code><\/pre>\n\n\n\n<p>\u5728\u6b64\u00a0\u793a\u4f8b\u4e2d\uff0c\u00a0<code>Bike<\/code>\u662f\u5b9a\u4e49\u5bf9\u8c61\u7684\u666e\u901aJavaScript\u51fd\u6570\u3002\u6211\u4eec\u9075\u5faaJavaScript\u7ea6\u5b9a\u5e76\u5927\u5199\u7b2c\u4e00\u4e2a\u5355\u8bcd\u6765\u8868\u793a\u6b64\u51fd\u6570\u662f\u6784\u9020\u51fd\u6570\u3002\u8be5<code>new<\/code>\u5173\u952e\u5b57\u662f\u81f3\u5173\u91cd\u8981\u7684\u3002\u5982\u679c\u4e0d\u4f7f\u7528<code>new<\/code>\uff0c\u5219<code>this<\/code>\u6307\u9488\u5c06\u4e0d\u4f1a\u6307\u5411\u60a8\u671f\u671b\u7684\u5bf9\u8c61\uff0c\u5e76\u4e14\u4f1a\u5bfc\u81f4\u610f\u5916\u7684\u884c\u4e3a\u3002<code>this<\/code>\u5f53\u6211\u4eec\u5728\u4ee5\u540e\u7684\u5355\u5143\u4e2d\u4ecb\u7ecd\u4e0a\u4e0b\u6587\u65f6\uff0c\u6211\u4eec\u4f1a\u91cd\u65b0\u8fdb\u884c\u8ba8\u8bba\u3002\u00a0<\/p>\n\n\n\n<p>\u8bf7\u6ce8\u610f\uff0c\u8be5<code>changeGear<\/code>\u51fd\u6570\u7684\u5206\u914d\u662f\u901a\u8fc7\u4f7f\u7528\u6765\u5b8c\u6210\u7684<code>prototype<\/code>\u3002\u8fd9\u6837\u53ef\u4ee5\u786e\u4fdd\u51fd\u6570\u5b9a\u4e49\u4e00\u6b21\uff0c\u5e76\u7531\u8be5\u6784\u9020\u51fd\u6570\u521b\u5efa\u7684\u6240\u6709\u5b9e\u4f8b\u5171\u4eab\u3002\u6211\u4eec\u5c06\u5728\u672c\u5355\u5143\u540e\u9762\u4ecb\u7ecd\u539f\u578b\u7684\u4f7f\u7528\u548c\u7ee7\u627f\u3002&nbsp;<\/p>\n\n\n\n<p>\u5728\u8bed\u6cd5\u65b9\u9762\uff0c\u5bf9\u8c61\u6587\u5b57\u8868\u793a\u6cd5\u548c\u6784\u9020\u51fd\u6570\u5b8c\u5168\u4e0d\u540c\u3002\u4f46\u662f\u5728\u6bcf\u79cd\u60c5\u51b5\u4e0b\uff0c\u60a8\u4ecd\u7136\u6700\u7ec8\u4f1a\u5728\u5185\u5b58\u4e2d\u521b\u5efa\u4e00\u4e2a\u65b0\u5bf9\u8c61\uff0c\u5e76\u4f7f\u7528\u53d8\u91cf<code>bike<\/code>\u4f5c\u4e3a\u6307\u5411\u8be5\u5bf9\u8c61\u7684\u6307\u9488\u3002\u4f7f\u7528\u6784\u9020\u51fd\u6570\uff0c\u60a8\u53ef\u4ee5\u4f7f\u8bb8\u591a<code>Bike<\/code>\u5177\u6709\u76f8\u540c\u5c5e\u6027\u548c\u529f\u80fd\u7684\u5bf9\u8c61\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><a href=\"https:\/\/trailhead.salesforce.com\/content\/learn\/modules\/javascript-essentials-salesforce-developers\/work-with-obj-class-prototype#-----------assigning-properties-and-functions-to-objects--\"><\/a>\u4e3a\u5bf9\u8c61\u5206\u914d\u5c5e\u6027\u548c\u529f\u80fd<\/h2>\n\n\n\n<p>\u5982\u679c\u4ece<code>bike<\/code>\u4e0a\u9762\u7684\u793a\u4f8b\u63a8\u65ad\u51fa\u5bf9\u8c61\u4e2d\u6709\u4e24\u79cd\u53ef\u80fd\u7684\u6210\u5458\u7c7b\u578b-\u5c5e\u6027\u548c\u51fd\u6570-\u60a8\u5c06\u662f\u6b63\u786e\u7684\u3002 &nbsp;<\/p>\n\n\n\n<p>\u5c5e\u6027\u5177\u6709\u4e09\u79cd\u57fa\u672c\u5f62\u72b6\u3002<\/p>\n\n\n\n<ul class=\"wp-block-list\"><li>\u539f\u8bed<\/li><li>\u5bf9\u8c61<\/li><li>\u6570\u7ec4<\/li><\/ul>\n\n\n\n<p>\u6709\u516d\u79cd\u57fa\u672c\u7c7b\u578b\u5728JavaScript\uff1a\u5b57\u7b26\u4e32\uff0c\u6570\u5b57\uff0c\u5e03\u5c14<code>null<\/code>\uff0c<code>undefined<\/code>\u548c\u7b26\u53f7\u3002\u5982\u679c\u53d8\u91cf\u662f\u539f\u59cb\u7c7b\u578b\uff0c\u5219\u5728\u5206\u914d\u65f6\u6309\u503c\u4f20\u9012\u3002\u4e5f\u5c31\u662f\u8bf4\uff0c\u6bcf\u6b21\u5206\u914d\u57fa\u5143\u65f6\uff0c\u90fd\u4f1a\u590d\u5236\u503c\u5e76\u5c06\u5176\u5206\u914d\u7ed9\u65b0\u53d8\u91cf\u3002&nbsp;<\/p>\n\n\n\n<p>\u51e0\u4e4e\u6240\u6709\u4e0d\u662fJavaScript\u4e2d\u539f\u59cb\u8bed\u8a00\u7684\u4e1c\u897f\u90fd\u662f\u5bf9\u8c61\u3002\u5728\u5bf9\u8c61\u6587\u5b57\u8868\u793a\u6cd5\u4e2d\uff0c\u5bf9\u8c61\u5c5e\u6027\u7528\u5927\u62ec\u53f7\u8868\u793a\u3002&nbsp;<\/p>\n\n\n\n<p>\u6570\u7ec4\u672c\u8eab\u4e5f\u88ab\u5b9e\u73b0\u4e3aJavaScript\u4e2d\u7684\u5bf9\u8c61\u3002\u53ef\u4ee5\u4f7f\u7528<code>Array()<\/code>\u6784\u9020\u51fd\u6570\u6216\u4ee5\u65b9\u62ec\u53f7\u8868\u793a\u7684\u6587\u5b57\u7b26\u53f7\u6765\u521b\u5efa\u6570\u7ec4\u3002&nbsp;<\/p>\n\n\n\n<p>\u51fd\u6570\u5728\u6b64\u6a21\u5757\u4e2d\u6709\u5176\u81ea\u5df1\u7684\u5355\u5143\uff0c\u56e0\u6b64\u6211\u4eec\u5728\u8fd9\u91cc\u4e0d\u518d\u8ba8\u8bba\u5b83\u4eec\uff0c\u4f46\u662f\u57fa\u4e8e\u4ee5\u4e0a\u5185\u5bb9\uff0c\u8ba9\u6211\u4eec\u901a\u8fc7<code>bike<\/code>\u4f7f\u7528\u5bf9\u8c61\u6587\u5b57\u7b26\u53f7\u5b9a\u4e49\u66f4\u590d\u6742\u7684\u5bf9\u8c61\u7684\u65b9\u6cd5\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>const bike = {\n  frontGearIndex: 0,\n  rearGearIndex: 0,\n  transmission: {\n    frontGearTeeth: [30,45],\n    rearGearTeeth: [11,13,15,17,19,21,24,28,32,36]\n  },\n  calculateGearRatio: function() {\n    let front = this.transmission.frontGearTeeth[this.frontGearIndex],\n        rear = this.transmission.rearGearTeeth[this.rearGearIndex];\n    return (front \/ rear);\n  },\n  changeGear: function(frontOrRear, newValue) {\n    if (frontOrRear === 'front') {\n      this.frontGearIndex = newValue;\n    } else {\n      this.rearGearIndex = newValue;\n    }\n  }\n};<\/code><\/pre>\n\n\n\n<p><strong>\u901a\u8fc7\u62ec\u53f7\u8bed\u6cd5\u5f15\u7528\u5c5e\u6027<\/strong><\/p>\n\n\n\n<p>\u5f15\u7528\u5bf9\u8c61\u6210\u5458\u901a\u5e38\u662f\u4f7f\u7528\u70b9\u7b26\u53f7\u6765\u5b8c\u6210\u7684\u3002\u4f8b\u5982\uff0c\u5728\u524d\u9762\u7684\u793a\u4f8b\u4e2d\uff0c\u6211\u4eec\u6309\u5982\u4e0b\u65b9\u5f0f\u5f15\u7528\u5bf9\u8c61\u7684\u5c5e\u6027\u548c\u529f\u80fd\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>bike.frontGearIndex\nbike.transmission.frontGearTeeth\nbike.calculateGearRatio()<\/code><\/pre>\n\n\n\n<p>\u7528\u70b9\u8868\u793a\u6cd5\uff0c\u5bf9\u5c5e\u6027\u540d\u79f0\u6709\u4e25\u683c\u7684\u89c4\u5b9a\u3002\u4f46\u662f\uff0cJavaScript\u8fd8\u5141\u8bb8\u4f7f\u7528\u53e6\u4e00\u79cd\u79f0\u4e3a\u62ec\u53f7\u7b26\u53f7\u7684\u8bed\u6cd5\u3002\u4e0a\u9762\u7684\u6210\u5458\u5c06\u5728\u62ec\u53f7\u4e2d\u5f15\u7528\u5982\u4e0b\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>bike[\"frontGearIndex\"]\nbike[\"transmission\"][\"frontGearTeeth\"]\nbike[\"calculateGearRatio\"]()<\/code><\/pre>\n\n\n\n<p>\u867d\u7136\u9700\u8981\u66f4\u591a\u7684\u8f93\u5165\uff0c\u4f46\u65b9\u62ec\u53f7\u8868\u793a\u6cd5\u6709\u4e24\u4e2a\u597d\u5904\u3002\u60a8\u53ef\u4ee5\u4e3a\u5c5e\u6027\u6216\u51fd\u6570\u547d\u540d\u4efb\u4f55\u6240\u9700\u7684\u540d\u79f0\uff0c\u5e76\u4e14\u7531\u4e8e\u5b83\u662f\u5b57\u7b26\u4e32\uff0c\u56e0\u6b64\u53ef\u4ee5\u901a\u8fc7\u53d8\u91cf\u4f20\u9012\u5c5e\u6027\u6216\u51fd\u6570\u540d\u79f0\u5e76\u8fdb\u884c\u8c03\u7528\u3002<\/p>\n\n\n\n<p>\u8ba9\u6211\u4eec\u901a\u8fc7\u91cd\u65b0\u6784\u60f3<code>changeGear<\/code>\u529f\u80fd\u6765\u4e86\u89e3\u8fd9\u4e00\u70b9\u3002\u73b0\u5728\uff0c\u6211\u4eec\u4f7f\u7528\u56db\u4e2a\u529f\u80fd\u6765\u5b9a\u4e49\u524d\u540e\u9f7f\u8f6e\u7684\u4e0a\u4e0b\u53d8\u901f\u3002\u5728<code>changeGear<\/code>\u51fd\u6570\u4e2d\uff0c\u6211\u4eec\u6839\u636eString\u53c2\u6570\u6784\u9020\u8981\u8c03\u7528\u7684\u51fd\u6570\u540d\u79f0\uff0c\u7136\u540e\u8c03\u7528\u5b83\u3002&nbsp;<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>changeGear: function(frontOrRear, upOrDown) {\n  let shiftFunction = frontOrRear + upOrDown;\n  this[shiftFunction]();\n},\nfrontUp: function(){\n  this.frontGearIndex += 1;\n},\nfrontDown: function(){\n  this.frontGearIndex -= 1;\n},\nrearUp: function(){\n  this.rearGearIndex += 1;\n},\nrearDown: function(){\n  this.rearGearIndex -= 1;\n}<\/code><\/pre>\n\n\n\n<p>\u5c06\u5b83\u4eec\u6dfb\u52a0\u5230\u6211\u4eec\u7684\u81ea\u884c\u8f66\u5bf9\u8c61\u4e2d\uff0c\u6211\u4eec\u53ef\u4ee5\u5728\u5de5\u4f5c\u4e2d\u770b\u5230\u5b83\u4eec\u3002&nbsp;<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>console.log(bike.calculateGearRatio()); \/\/ 2.727272727\n\/\/Calls the frontUp() function\nbike.changeGear(\"front\", \"Up\");\nconsole.log(bike.calculateGearRatio()); \/\/ 4.090909091\n\/\/calls the rearUp() function\nbike.changeGear(\"rear\", \"Up\");\nconsole.log(bike.calculateGearRatio()); \/\/ 3.461538461<\/code><\/pre>\n\n\n\n<h2 class=\"wp-block-heading\"><a href=\"https:\/\/trailhead.salesforce.com\/content\/learn\/modules\/javascript-essentials-salesforce-developers\/work-with-obj-class-prototype#-----------object-mutability--\"><\/a>\u5bf9\u8c61\u53ef\u53d8\u6027<\/h2>\n\n\n\n<p>\u9664\u4e86\u7528\u4e8e\u5b9a\u4e49\u5bf9\u8c61\u7684\u4e0d\u540c\u8bed\u6cd5\u5916\uff0cJavaScript\u5bf9\u8c61\u8fd8\u6709\u53e6\u4e00\u4e2a\u5173\u952e\u539f\u7406\uff1a\u53ef\u53d8\u6027\u3002&nbsp;<\/p>\n\n\n\n<p>JavaScript\u4e2d\u7684\u5bf9\u8c61\u662f\u53ef\u53d8\u7684\uff0c\u8fd9\u610f\u5473\u7740\u5982\u679c\u60a8\u60f3\u8981\u4fee\u6539\u5bf9\u8c61\u7684\u5f62\u72b6\uff0c\u5219\u53ef\u4ee5\u3002&nbsp;<\/p>\n\n\n\n<p>\u8ba9\u6211\u4eec\u6765\u770b\u770b<code>bike<\/code>\u6211\u4eec\u521b\u5efa\u7684\u5bf9\u8c61\u3002\u4f8b\u5982\uff0c\u6211\u4eec\u53ef\u4ee5\u6dfb\u52a0\u4e00\u4e2a\u65b0\u7684\u5c5e\u6027\u6216\u51fd\u6570\u3002&nbsp;<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>bike.isTandem = true;\nbike.popAWheelie = function() {\n\u2026\n};<\/code><\/pre>\n\n\n\n<p>\u5373\u4f7f\u60a8\u53ef\u80fd\u65e0\u6cd5\u8bbf\u95ee\u6700\u521d\u5b9a\u4e49\u5bf9\u8c61\u7684\u4ee3\u7801\uff0c\u4e5f\u53ef\u4ee5\u5728\u5c06\u5bf9\u8c61\u4fdd\u5b58\u5728\u5185\u5b58\u4e2d\u540e\u4fee\u6539\u5176\u5f62\u72b6\u3002\u4e0d\u8fc7\uff0c\u91cd\u8981\u7684\u4e00\u70b9\u662f\uff0c\u53ea\u6709\u4e00\u4e2a\u5bf9\u8c61\u5b9e\u4f8b\u53d1\u751f\u4e86\u53d8\u5316\u3002\u8ba9\u6211\u4eec\u56de\u987e\u4e00\u4e0b\u6211\u4eec\u7684<code>Bike<\/code>&nbsp;\u6784\u9020\u51fd\u6570\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>const bike1 = new Bike();\nconst bike2 = new Bike();\nbike1.isTandem = true;\nconsole.log(bike1.isTandem); \/\/ true\nconsole.log(bike2.isTandem); \/\/ undefined<\/code><\/pre>\n\n\n\n<p>\u5982\u679c\u60a8\u5e0c\u671b\u591a\u4e2a\u5bf9\u8c61\u5171\u4eab\u76f8\u540c\u7684\u5c5e\u6027\u6216\u65b9\u6cd5\uff0c\u5219\u6709\u4e00\u4e2a\u7ee7\u627f\u6a21\u578b\u3002\u8ba9\u6211\u4eec\u770b\u770b\u3002&nbsp;<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><a href=\"https:\/\/trailhead.salesforce.com\/content\/learn\/modules\/javascript-essentials-salesforce-developers\/work-with-obj-class-prototype#-----------objects-and-inheritance--\"><\/a>\u5bf9\u8c61\u4e0e\u7ee7\u627f<\/h2>\n\n\n\n<p>\u5c3d\u7ba1\u6ca1\u6709\u53e4\u5178\u8bed\u8a00\u5b9a\u4e49\u7684\u7c7b\uff0cJavaScript\u4ecd\u5177\u6709\u4e00\u4e2a\u7ee7\u627f\u6a21\u578b\uff0c\u79f0\u4e3a<em>\u539f\u578b\u7ee7\u627f<\/em>\u3002&nbsp;<\/p>\n\n\n\n<p>\u5b9e\u9645\u4e0a\uff0c\u539f\u578b\u662f\u53e6\u4e00\u4e2a\u5bf9\u8c61\u3002\u5b83\u4f4d\u4e8e\u5185\u5b58\u4e2d\uff0c\u5e76\u5b9a\u4e49\u5176\u4ed6\u5bf9\u8c61\u5171\u4eab\u76f8\u540c\u539f\u578b\u65f6\u6240\u7ee7\u627f\u7684\u5c5e\u6027\u6216\u51fd\u6570\u3002&nbsp;<\/p>\n\n\n\n<p>\u4f20\u7edf\u4e0a\uff0cJavaScript\u5bf9\u8c61\u901a\u8fc7\u5171\u4eab\u76f8\u540c\u7684\u6784\u9020\u51fd\u6570\u6765\u5171\u4eab\u76f8\u540c\u7684\u539f\u578b\u3002\u8bb0\u4f4f<code>Bike<\/code>\u00a0\u6784\u9020\u51fd\u6570\u3002\u6211\u4eec\u5c06<code>changeGear<\/code>\u51fd\u6570\u5206\u914d\u7ed9<code>prototype<\/code>\u3002\u00a0<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>function Bike(gears, startGear) {\n  this.gears = gears;\n  this.currentGear = startGear;\n}\nBike.prototype.changeGear = function(direction, changeBy) {\n  if (direction === 'up') {\n    this.currentGear += changeBy;\n  } else {\n    this.currentGear -= changeBy;\n  }\n}<\/code><\/pre>\n\n\n\n<p>\u8fd9\u6837\uff0c\u4ece\u4e2d\u521b\u5efa\u7684\u6bcf\u4e2a\u5bf9\u8c61\u90fd\u4f1a<code>Bike<\/code>\u7ee7\u627f\u8be5<code>changeGear<\/code>\u51fd\u6570\u3002&nbsp;<\/p>\n\n\n\n<p>\u60a8\u8fd8\u53ef\u4ee5\u4f7f\u7528\u539f\u578b\u5b9e\u73b0\u591a\u7ea7\u7ee7\u627f\u3002\u5b83\u88ab\u79f0\u4e3a\u539f\u578b\u94fe\u3002\u4f7f\u7528\u6784\u9020\u51fd\u6570\u6765\u5b9e\u73b0\u539f\u578b\u94fe\u975e\u5e38\u590d\u6742\uff0c\u5e76\u4e14\u9700\u8981\u5927\u91cf\u6837\u677f\u4ee3\u7801\u3002\u5b83\u4e5f\u8d85\u51fa\u4e86\u672c\u6a21\u5757\u7684\u8303\u56f4\u3002\u60a8\u9700\u8981\u77e5\u9053\u7684\u662f\uff0c\u4e3a\u4e86\u89e3\u51b3\u539f\u578b\u94fe\u7684\u590d\u6742\u6027\uff0cECMA\u4e3a\u5b9e\u73b0\u7ee7\u627f\u7684\u66f4\u76f4\u63a5\u7684\u8bed\u6cd5\u5236\u5b9a\u4e86\u4e00\u4e2a\u6807\u51c6\uff1a<code>class<\/code>\u8bed\u6cd5\u3002&nbsp;<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><a href=\"https:\/\/trailhead.salesforce.com\/content\/learn\/modules\/javascript-essentials-salesforce-developers\/work-with-obj-class-prototype#-----------classes-and-javascript--\"><\/a>\u7c7b\u548cJavaScript<\/h2>\n\n\n\n<p>\u5982\u679c\u60a8\u9605\u8bfb\u201c\u7c7b\u201d\u4e00\u8bcd\u5e76\u611f\u5230\u6e29\u6696\u800c\u6a21\u7cca\uff0c\u4ee5\u4e3a\u60a8\u6b63\u5728\u5bfb\u627e\u53ef\u4ee5\u521b\u5efa\u57fa\u4e8e\u7c7b\u7684\u771f\u6b63\u7ee7\u627f\u7684\u4e1c\u897f\uff0c\u8bf7\u51c6\u5907\u611f\u5230\u5931\u671b\u3002\u5c3d\u7ba1\u5982\u6b64\uff0c<code>class<\/code>JavaScript\u4e2d\u7684\u5173\u952e\u5b57\u8fd8\u662f\u4e00\u4e2a\u4e0d\u9519\u7684\u8bed\u6cd5\u7cd6\uff0c\u53ef\u4ee5\u4f7f\u7528\u6784\u9020\u51fd\u6570\u6765\u89e3\u51b3\u539f\u578b\u7ee7\u627f\u7684\u590d\u6742\u6027\u3002\u5728\u5e55\u540e\uff0c\u5f15\u64ce\u4ecd\u5728\u4f7f\u7528\uff0c<code>Object.create<\/code>\u5e76\u4e14\u6ca1\u6709\u7c7b\uff08\u5728\u9762\u5411\u5bf9\u8c61\u7684\u610f\u4e49\u4e0a\uff09\uff0c\u53ea\u662f\u5185\u5b58\u4e2d\u7684\u539f\u578b\u5bf9\u8c61\u662f\u5b9e\u9645\u7684\u7ee7\u627f\u6e90\u3002&nbsp;<\/p>\n\n\n\n<p>\u597d\u6d88\u606f\u662f\uff0c\u5b83\u786e\u5b9e\u4eceJava\u6216C\uff03\u4e2d\u8bfb\u53d6\u4e86\u5f88\u591a\u7c7b\u4f3c\u7684\u4ee3\u7801\uff0c\u5e76\u4e14\u9700\u8981\u8003\u8651\u4e00\u4e9bJavaScript\u7279\u5b9a\u7684\u5185\u5bb9\u3002&nbsp;<\/p>\n\n\n\n<h4 class=\"wp-block-heading\"><a href=\"https:\/\/trailhead.salesforce.com\/content\/learn\/modules\/javascript-essentials-salesforce-developers\/work-with-obj-class-prototype#note-1\"><\/a>\u6ce8\u610f<\/h4>\n\n\n\n<p>\u5f53\u7531Lightning Web Components\u4f7f\u7528\u65f6\uff0c\u5305\u62ec\u7c7b\u8bed\u6cd5\u7684\u591a\u7ea7\u539f\u578b\u94fe\u8d85\u51fa\u4e86\u6b64\u6a21\u5757\u3002\u6709\u5173\u4f7f\u7528JavaScript\u5bf9\u8c61\u7684\u8f83\u65b0\u529f\u80fd\u7684\u66f4\u591a\u8be6\u7ec6\u4fe1\u606f\uff0c\u8bf7\u53c2\u89c1\u672c\u5355\u5143\u672b\u5c3e\u7684\u8d44\u6e90\u94fe\u63a5\u3002\u6211\u4eec\u5f3a\u70c8\u5efa\u8bae\u60a8\u5728\u672c\u6559\u7a0b\u4e2d\u4f7f\u7528\u5176\u4ed6&nbsp;<a href=\"https:\/\/trailhead.salesforce.com\/content\/learn\/modules\/modern-javascript-development\" target=\"_blank\" rel=\"noreferrer noopener\">\u6a21\u5757<\/a>\uff0c\u5373Modern JavaScript Development\uff0c\u8be5\u6a21\u5757\u5728Classes\u4e2d\u6709\u4e00\u4e2a\u5b8c\u6574\u7684\u5355\u5143<\/p>\n\n\n\n<p>\u5c3d\u7ba1\u6211\u4eec\u5728\u8fd9\u91cc\u4e0d\u4f1a\u6df1\u5165\u63a2\u8ba8JavaScript\u7c7b\u7684\u7ec6\u8282\uff0c\u4f46\u51fa\u4e8e\u5b66\u672f\u76ee\u7684\uff0c\u5f88\u9ad8\u5174\u770b\u5230\u4f7f\u7528\u7c7b\u8bed\u6cd5\u5b9e\u73b0\u7684bike\u5bf9\u8c61\u7684\u7248\u672c\u3002&nbsp;<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>class Bike {\n    constructor(gears, startGear){\n        this.gears = gears;\n        this.currentGear = startGear;\n    }\n    changeGear(direction, changeBy) {\n        if (direction === 'up') {\n            this.currentGear += changeBy;\n        } else {\n            this.currentGear -= changeBy;\n        }\n    }\n}\nconst bike = new Bike(10, 5);\nconsole.log(bike.currentGear); \/\/ 5\nbike.changeGear('up', 2);\nconsole.log(bike.currentGear); \/\/ 7<\/code><\/pre>\n\n\n\n<p>\u5982\u60a8\u6240\u89c1\uff0c\u8bed\u6cd5\u770b\u8d77\u6765\u66f4\u50cfJava\u6216Apex\u4e2d\u7684\u7c7b\u3002\u660e\u663e\u7684\u533a\u522b\u662f\uff0c\u6784\u9020\u51fd\u6570\u59cb\u7ec8\u4e3a\u547d\u540d<code>constructor<\/code>\u3002\u4e00\u4e2a\u91cd\u8981\u7684\u529f\u80fd\u662f\uff0c\u51fd\u6570\u548c\u5c5e\u6027\u81ea\u52a8\u5c5e\u4e8e\u539f\u578b\u94fe\uff0c\u800c\u4e0d\u5fc5\u76f4\u63a5\u5f15\u7528Object.prototype\u3002\u8fd9\u4e5f\u7b80\u5316\u4e86\u521b\u5efa\u591a\u7ea7\u539f\u578b\u7ee7\u627f\u7684\u8fc7\u7a0b\u3002&nbsp;<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><a href=\"https:\/\/trailhead.salesforce.com\/content\/learn\/modules\/javascript-essentials-salesforce-developers\/work-with-obj-class-prototype#-----------lightning-web-components-and-objects--\"><\/a>\u95ea\u7535Web\u7ec4\u4ef6\u548c\u5bf9\u8c61<\/h2>\n\n\n\n<p>\u672c\u5355\u5143\u7684\u51e0\u4e2a\u90e8\u5206\u4e0e\u5f00\u53d1Lightning Web 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