{"id":2413,"date":"2020-06-25T23:19:57","date_gmt":"2020-06-25T15:19:57","guid":{"rendered":"http:\/\/www.ponybai.com\/?p=2413"},"modified":"2020-06-25T23:19:57","modified_gmt":"2020-06-25T15:19:57","slug":"salesforce%e5%bc%80%e5%8f%91%e4%ba%ba%e5%91%98%e7%9a%84javascript%e6%8a%80%e8%83%bd-%e4%ba%86%e8%a7%a3javascript%e6%a0%b8%e5%bf%83%e6%a6%82%e5%bf%b5","status":"publish","type":"post","link":"http:\/\/www.ponybai.com\/?p=2413","title":{"rendered":"Salesforce\u5f00\u53d1\u4eba\u5458\u7684JavaScript\u6280\u80fd-\u4e86\u89e3JavaScript\u6838\u5fc3\u6982\u5ff5"},"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 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href=\"https:\/\/trailhead.salesforce.com\/content\/learn\/modules\/javascript-essentials-salesforce-developers\/learn-js-core-concepts#-----------the-what-why-and-how-of-javascript--\"><\/a>JavaScript\u7684\u5185\u5bb9\uff0c\u539f\u56e0\u548c\u65b9\u5f0f<\/h2>\n\n\n\n<p>\u57282000\u5e74\u4ee3\u521d\u671f\uff0c\u8f6f\u4ef6\u4e16\u754c\u5f00\u59cb\u7206\u70b8\uff0c\u60a8\u53ef\u4ee5\u6784\u5efa\u5b8c\u5168\u901a\u8fc7Internet\u6258\u7ba1\u548c\u4ea4\u4ed8\u7684\u5e94\u7528\u7a0b\u5e8f\u3002\u5c3d\u7ba1\u6211\u4eec\u73b0\u5728\u5c06Web\u5e94\u7528\u7a0b\u5e8f\u89c6\u4e3a\u7406\u6240\u5f53\u7136\uff0c\u4f46\u5f53\u65f6\u5b83\u4eec\u5c31\u50cf\u770b\u5230\u673a\u5668\u4eba\u9a91\u81ea\u884c\u8f66\u4e00\u6837\u4ee4\u4eba\u7740\u8ff7\u3002&nbsp;<\/p>\n\n\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"https:\/\/jaxbikecoalition.files.wordpress.com\/2011\/11\/screen-shot-2011-11-14-at-10-39-01-am.png\" 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href=\"https:\/\/trailhead.salesforce.com\/content\/learn\/modules\/javascript-essentials-salesforce-developers\/learn-js-core-concepts#-----------the-javascript-runtime--\"><\/a>JavaScript\u8fd0\u884c\u65f6<\/h2>\n\n\n\n<p>JavaScript\u8fd0\u884c\u65f6\u662f\u89e3\u91caJavaScript\u4ee3\u7801\u7684\u5f15\u64ce\u3002\u5b83\u53ef\u4ee5\u662f\u6d4f\u89c8\u5668\u6216\u670d\u52a1\u5668\u7b49\u5176\u4ed6\u8fd0\u884c\u65f6\u73af\u5883\u7684\u4e00\u90e8\u5206\u3002\u73b0\u4ee3JavaScript\u5f15\u64ce\u529f\u80fd\u5b8c\u5584\uff0c\u529f\u80fd\u5f3a\u5927\uff0c\u53ef\u4ee5\u4f18\u5316\u6267\u884c\uff0c\u5e76\u7b26\u5408ECMAScript\u6807\u51c6\u3002&nbsp;<\/p>\n\n\n\n<p>JavaScript\u5f15\u64ce\u7684\u5b9a\u4e49\u529f\u80fd\u662f\u7531\u4e0b\u9762\u7684\u5806\u6808\u8868\u793a\u7684\u5355\u7ebf\u7a0b\u8fd0\u884c\u65f6\u3002\u5728\u5806\u6808\u4e2d\u5b8c\u6210\u7684\u5de5\u4f5c\u62e5\u6709\u7ebf\u7a0b\uff0c\u5e76\u4e14\u5fc5\u987b\u5148\u5b8c\u6210\u5176\u540c\u6b65\u903b\u8f91\uff0c\u7136\u540e\u518d\u79fb\u4ea4\u5bf9\u7ebf\u7a0b\u7684\u63a7\u5236\u3002&nbsp;<\/p>\n\n\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"https:\/\/res.cloudinary.com\/hy4kyit2a\/f_auto,fl_lossy,q_70\/learn\/modules\/javascript-essentials-salesforce-developers\/learn-js-core-concepts\/images\/92b5decb1f19ad98cc633377be184f08_cjkoneyi-4000-b-0-xcef-4-s-4705-j.png\" alt=\"\u5177\u6709\u5806\u6808\uff0c\u961f\u5217\uff0c\u4e8b\u4ef6\u548cAPI\u7684JavaScript\u5f15\u64ce\"\/><\/figure>\n\n\n\n<p>\u8fd0\u884c\u65f6\u662f\u4e00\u4e2a\u7e41\u5fd9\u7684\u5730\u65b9\u3002\u53ef\u4ee5\u968f\u65f6\u968f\u5730\u4ece\u8bb8\u591a\u6765\u6e90\u6765\u8fdb\u884c\u65b0\u5de5\u4f5c\uff0c\u5305\u62ec\u7528\u6237\uff08UI\u4e8b\u4ef6\uff09\u548cWeb 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href=\"https:\/\/trailhead.salesforce.com\/content\/learn\/modules\/javascript-essentials-salesforce-developers\/learn-js-core-concepts#-----------javascript-the-language--\"><\/a>JavaScript\u8bed\u8a00<\/h2>\n\n\n\n<p>\u4f5c\u4e3a\u4e00\u79cd\u8bed\u8a00\uff0cJavaScript\u7ecf\u5e38\u88ab\u8bef\u89e3\u3002\u5982\u679c\u60a8\u5c06\u5176\u62fe\u8d77\u4efb\u4f55\u65f6\u95f4\uff0c\u65e0\u7591\u4f1a\u95ee\u81ea\u5df1\u4e00\u4e9b\u95ee\u9898\u3002\u5b83\u662f\u811a\u672c\u8bed\u8a00\u5417\uff1f\u5b83\u4e0eJava\u6709\u4ec0\u4e48\u5173\u7cfb\uff1f\u5b83\u662f\u4e00\u79cd\u771f\u6b63\u7684\u7f16\u7a0b\u8bed\u8a00\u5417\uff1f\u4e3a\u4ec0\u4e48\u4f1a\u505a<em>\u90a3<\/em>\uff1f&nbsp;<\/p>\n\n\n\n<p>\u8ba9\u6211\u4eec\u56f4\u7ed5JavaScript\u4f5c\u4e3a\u4e00\u79cd\u8bed\u8a00\u6765\u8bbe\u7f6e\u4e00\u4e9b\u4e0a\u4e0b\u6587\uff0c\u4ee5\u5e2e\u52a9\u60a8\u56de\u7b54\u5176\u4e2d\u7684\u4e00\u4e9b\u95ee\u9898\u3002&nbsp;<\/p>\n\n\n\n<p><strong>JavaScript\u6b63\u5728\u6539\u53d8<\/strong><\/p>\n\n\n\n<p>\u56e0\u4e3aJavaScript\u662f\u6839\u636eECMAScript\u6807\u51c6\u6784\u5efa\u7684\uff0c\u6240\u4ee5\u5b83\u4e00\u76f4\u5728\u53d8\u5316\u3002\u6bcf\u5e74\u90fd\u4f1a\u53d1\u5e03\u63cf\u8ff0\u65b0\u529f\u80fd\u7684\u6807\u51c6\u66f4\u65b0\uff0c\u7136\u540eJavaScript\u5f15\u64ce\u9879\u76ee\uff08\u6d4f\u89c8\u5668\u548c\u8fd0\u884c\u65f6\u5236\u9020\u5546\uff09\u5c06\u5b83\u4eec\u5b89\u88c5\u5230\u4f4d\u3002&nbsp;<\/p>\n\n\n\n<p>\u968f\u7740JavaScript\u7684\u6210\u719f\uff0c\u66f4\u65b0\u53ef\u80fd\u5305\u62ec\u66f4\u591a\u73b0\u4ee3\u8bed\u8a00\u529f\u80fd\u3002\u5728\u5176\u4ed6\u60c5\u51b5\u4e0b\uff0c\u6dfb\u52a0\u529f\u80fd\u4ee5\u5b9e\u73b0\u73b0\u6709\u529f\u80fd\u7684\u66f4\u7b80\u6d01\u7684\u8bed\u6cd5\uff08\u8fd9\u4e9b\u79f0\u4e3a<em>\u8bed\u6cd5\u7cd6<\/em>\uff09\u3002&nbsp;<\/p>\n\n\n\n<p><strong>API\u7684\u91c7\u7528\u5e76\u4e0d\u666e\u904d<\/strong><\/p>\n\n\n\n<p>\u8fd9\u53e5\u8bdd\u770b\u8d77\u6765\u5f88\u5413\u4eba\uff0c\u4f46\u662f\u7edd\u5927\u591a\u6570JavaScript API\u90fd\u53ef\u4ee5\u5728\u6700\u5e38\u89c1\u7684\u6d4f\u89c8\u5668\u5e73\u53f0\u4e0a\u4f7f\u7528\u3002\u5c3d\u7ba1\u5982\u6b64\uff0c\u5b9e\u73b0\u8005\u5e76\u6ca1\u6709\u4ee5\u76f8\u540c\u7684\u901f\u5ea6\u91c7\u7528\u6bcf\u79cd\u8bed\u8a00\u529f\u80fd\u6216API\u3002\u6709\u4e9b\u4eba\u4ece\u4e0d\u91c7\u7528\u67d0\u4e9b\u529f\u80fd\uff08\u5c3d\u7ba1\u8fd9\u79cd\u60c5\u51b5\u5f88\u5c11\u89c1\uff09\u3002\u901a\u5e38\uff0c\u5982\u679c\u60a8\u60f3\u4f7f\u7528\u8be5\u8bed\u8a00\u7684\u8f83\u65b0\u529f\u80fd\uff0c\u5219\u5e94\u4f7f\u7528caniuse.com\u4e4b\u7c7b\u7684\u8d44\u6e90\u6765\u4e86\u89e3\u5b83\u5728\u76ee\u6807\u6d4f\u89c8\u5668\u4e2d\u7684\u00a0\u8fd0\u884c\u60c5\u51b5\u3002\u00a0<\/p>\n\n\n\n<p>\u5982\u679c\u65b0\u529f\u80fd\u4e0d\u662f\u672c\u673a\u5b9e\u73b0\u7684\uff0c\u90a3\u4e48\u901a\u5e38\u4f1a\u7f16\u5199\u4e00\u4e9b\u4ee3\u7801\u6765\u6682\u65f6\u5b9e\u73b0\u8be5\u7f3a\u5931\u529f\u80fd\u7684\u76ee\u7684\u3002\u6b64\u4e34\u65f6\u586b\u5199\u4ee3\u7801\u79f0\u4e3apolyfill\u3002\u5b9e\u9645\u4e0a\uff0cLightning Component Framework\u4f7f\u7528\u7cbe\u9009\u7684polyfill\u5217\u8868\uff0c\u8fd9\u4e9b\u5217\u8868\u5728\u8fd0\u884c\u5176\u4ed6\u4ee3\u7801\u4e4b\u524d\u88ab\u5e94\u7528\u4ee5\u81ea\u52a8\u6539\u5584\u6d4f\u89c8\u5668\u7684\u517c\u5bb9\u6027\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\/learn-js-core-concepts#-----------indispensable-things-to-know--\"><\/a>\u5fc5\u4e0d\u53ef\u5c11\u7684\u4e8b\u60c5<\/h2>\n\n\n\n<p>\u73b0\u5728\u8be5\u770b\u4e00\u4e9b\u4ee3\u7801\u4e86\u3002\u8ba9\u6211\u4eec\u4ece\u6bcf\u4e2aJavaScript\u5f00\u53d1\u4eba\u5458\u5e94\u8be5\u77e5\u9053\u7684\u4e00\u4e9b\u4e8b\u60c5\u5f00\u59cb\uff0c\u4f7f\u4ed6\u4eec\u7684\u751f\u6d3b\u66f4\u8f7b\u677e\u3002&nbsp;<\/p>\n\n\n\n<p><strong>\u8bb0\u4f4f\u533a\u5206\u5927\u5c0f\u5199<\/strong><\/p>\n\n\n\n<p>JavaScript\u533a\u5206\u5927\u5c0f\u5199\u3002\u5bf9\u4e8e\u8bb8\u591a\u4e60\u60ef\u4e8eApex\u548cSOQL\u4e0d\u533a\u5206\u5927\u5c0f\u5199\u7684Salesforce\u5f00\u53d1\u4eba\u5458\u800c\u8a00\uff0c\u8fd9\u662f\u68d8\u624b\u7684\u3002\u8bf7\u8bb0\u4f4f\uff0c\u6bcf\u6b21\u5728Salesforce\u4e2d\u7f16\u5199JavaScript\u4ee3\u7801\u65f6\uff0c\u8bf7\u6ce8\u610f\u533a\u5206\u5927\u5c0f\u5199\u3002&nbsp;<\/p>\n\n\n\n<p><strong>\u58f0\u660e\u53d8\u91cf<\/strong><\/p>\n\n\n\n<p>\u53d8\u91cf\u58f0\u660e\u505a\u662f\u4f7f\u7528\u4e09\u4e2a\u8fd0\u8425\u5546\u4e4b\u4e00\uff1a<code>var<\/code>\uff0c<code>let<\/code>\uff0c\u548c<code>const<\/code>\u3002\u4e00\u822c\u4f7f\u7528<code>let<\/code>\u548c<code>const<\/code>\u3002\u4e0b\u8868\u603b\u7ed3\u4e86\u8fd9\u4e09\u4e2a\u5173\u952e\u5b57\u4e4b\u95f4\u7684\u529f\u80fd\u5dee\u5f02\u3002&nbsp;<\/p>\n\n\n\n<table class=\"wp-block-table\"><thead><tr><th>\u5173\u952e\u8bcd<br><\/th><th>\u8303\u56f4<br><\/th><th>\u53ef\u53d8\u5206\u914d<br><\/th><\/tr><\/thead><tbody><tr><td>\u53d8\u79cd<br><\/td><td>\u529f\u80fd<br><\/td><td>\u662f<br><\/td><\/tr><tr><td>\u8ba9<br><\/td><td>\u5757<br><\/td><td>\u662f<br><\/td><\/tr><tr><td>const<br><\/td><td>\u5757<br><\/td><td>\u6ca1\u6709<br><\/td><\/tr><\/tbody><\/table>\n\n\n\n<p>\u8303\u56f4\u662f\u6211\u4eec\u7a0d\u540e\u8ba8\u8bba\u7684\u4e3b\u9898\uff0c\u56e0\u6b64\u8ba9\u6211\u4eec\u89e3\u51b3\u53ef\u53d8\u6027\u7684\u542b\u4e49\u3002&nbsp;<\/p>\n\n\n\n<p>\u6240\u6709\u53d8\u91cf\u90fd\u662f\u6307\u9488\u3002\u8d4b\u503c\u662f\u5c06\u53d8\u91cf\u6307\u5411\u5185\u5b58\u4e2d\u67d0\u7269\u7684\u884c\u4e3a\u3002\u53ef\u53d8\u6027\u662f\u5728\u521d\u59cb\u5206\u914d\u53d8\u91cf\u540e\u662f\u5426\u53ef\u4ee5\u91cd\u65b0\u5206\u914d\u53d8\u91cf\u3002\u4f7f\u7528<code>var<\/code>\u6216<code>let<\/code>\u521b\u5efa\u53ef\u53d8\u6307\u9488\uff0c\u800c\u8be5\u6307\u9488<code>const<\/code>\u662f\u4e0d\u53ef\u53d8\u7684\u3002\u901a\u5e38\uff0c\u6700\u597d\u901a\u8fc7\u6f14\u793a\u6765\u7406\u89e3\u8fd9\u4e00\u70b9\u00a0\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\/learn-js-core-concepts#note-1\"><\/a>\u6ce8\u610f<\/h4>\n\n\n\n<p>JavaScript\u6e38\u4e50\u573a\u662f\u4e00\u4e2a\u6709\u4ef7\u503c\u7684\u5de5\u5177\uff0c\u53ef\u4ee5\u8bd5\u7528\u4ee3\u7801\uff0c\u5e76\u5728\u6d4f\u89c8\u5668\u4e2d\u5b9e\u65f6\u67e5\u770b\u5176\u5de5\u4f5c\u65b9\u5f0f\u3002\u6709\u5f88\u591aJavaScript\u6e38\u4e50\u573a\uff0c\u4f46\u662f\u5728\u672c\u6a21\u5757\u4e2d\uff0c\u6211\u4eec\u5c06\u94fe\u63a5\u5230jsbin\u4e2d\u7684\u793a\u4f8b\u00a0\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>\/\/primitive assignments\nvar myBike = \"Mountain Bike\";\nlet currentGear = 5;\nconst numberOfGears = 12;\n\/\/reassignment\nmyBike = \"Penny Farthing\"; \/\/ this works\ncurrentGear = 1; \/\/ so does this\nnumberOfGears = 1; \/\/ error<\/code><\/pre>\n\n\n\n<p>\u4ee5\u4e0a\uff0c<code>myBike<\/code>\u5e76\u4e14<code>currentGear<\/code>\u5728\u91cd\u65b0\u5206\u914d\u503c\u65f6\u6ca1\u6709\u95ee\u9898\u3002\u4f46\u662f\uff0c\u5f53\u5c1d\u8bd5\u8fd9\u6837\u505a\u65f6<code>numberOfGears<\/code>\uff0c\u4f1a\u51fa\u73b0\u9519\u8bef\u3002&nbsp;<\/p>\n\n\n\n<p>\u5f53\u00a0\u5de5\u4f5c\u4e0e\u5bf9\u8c61\uff08\u800c\u4e0d\u662f\u539f\u8bed\uff09\uff0c\u8bf7\u8bb0\u4f4f\uff0c<code>const<\/code>\u53ea\u6709\u9632\u6b62\u91cd\u65b0\u5206\u914d\u60a8\u7684\u53d8\u91cf\u8bbe\u7f6e\u4e0d\u540c\u7684\u5bf9\u8c61\u3002\u4ecd\u7136\u53ef\u4ee5\u66f4\u6539\u5bf9\u8c61\u672c\u8eab\uff08\u5176\u5c5e\u6027\uff0c\u51fd\u6570\u7b49\uff09\uff0c\u5982\u4e0b\u6240\u793a\u3002\u00a0<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>\/\/ call constructor, new object, assign it to bike\nconst bike = new Bike();\n\/\/Change internal state by calling a function\nbike.changeGear(\"front\", \"Up\");\n\/\/ add a new member to bike that did not exist before\nbike.type = \"Penny Farthing\";\n\/\/ check for success\nconsole.log(bike.calculateGearRatio()); \/\/ 4.0909...\nconsole.log(bike.type); \/\/ \"Penny Farthing\"\n\/\/ attempt to point bike to new instance of Bike\nbike = new Bike(1,2); \/\/ error<\/code><\/pre>\n\n\n\n<p>\u5728\u8fd9\u91cc\uff0c\u6211\u4eec\u4ece<code>Bike<\/code>\u6784\u9020\u51fd\u6570\u521b\u5efa\u4e00\u4e2a\u5bf9\u8c61\uff0c\u5e76\u5c06\u5176\u5206\u914d\u7ed9<code>bike<\/code>\u53d8\u91cf\uff08\u8bb0\u4f4f\uff0c\u533a\u5206\u5927\u5c0f\u5199\uff09\u3002\u7136\u540e\uff0c\u6211\u4eec\u53ef\u4ee5\u66f4\u6539\u6240\u9700\u7684\u4efb\u4f55\u5185\u5bb9\uff0c\u4f8b\u5982\u8c03\u7528\u66f4\u6539\u5176\u72b6\u6001\u751a\u81f3\u6dfb\u52a0\u65b0\u6210\u5458\u7684\u51fd\u6570\u3002\u4f46\u662f\uff0c\u5f53\u6211\u4eec\u5c1d\u8bd5\u5c06Bike\u91cd\u65b0\u5206\u914d\u7ed9\u5176\u4ed6\u4e1c\u897f\u65f6\uff0c\u5728\u8fd9\u79cd\u60c5\u51b5\u4e0b\uff0c\u901a\u8fc7\u518d\u6b21\u8c03\u7528\u6784\u9020\u51fd\u6570\uff0c\u5c31\u4f1a\u51fa\u73b0\u9519\u8bef\u3002&nbsp;<\/p>\n\n\n\n<p><strong>\u9690\u5f0f\u5f3a\u5236<\/strong><\/p>\n\n\n\n<p>\u5f53\u5927\u591a\u6570JavaScript\u8fd0\u7b97\u7b26\u9047\u5230\u65e0\u6548\u7c7b\u578b\u65f6\uff0c\u5b83\u4eec\u4f1a\u5c1d\u8bd5\u5c06\u503c\u8f6c\u6362\u4e3a\u6709\u6548\u7c7b\u578b\u3002\u8fd9\u79cd\u9690\u5f0f\u8f6c\u6362\u7c7b\u578b\u7684\u8fc7\u7a0b\u79f0\u4e3a<em>\u9690\u5f0f\u7c7b\u578b\u5f3a\u5236<\/em>\u3002\u8003\u8651\u4ee5\u4e0b\uff1a&nbsp;<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>let num1 = 9 * \"3\";\nconsole.log(num1); \/\/ 27 (a number)\nlet num2 = 9 + \"3\";\nconsole.log(num2); \/\/ \"93\" (a string)<\/code><\/pre>\n\n\n\n<p>\u5728\u7b2c\u4e00\u4e2a\u793a\u4f8b\u4e2d\uff0c<code>*<\/code>\u8fd0\u7b97\u7b26\u53ea\u80fd\u7528\u4e8e\u6570\u5b66\u8fd0\u7b97\uff0c\u5c06\u5b57\u7b26\u4e32\u5f3a\u5236<code>\"3\"<\/code>\u4e3a\u6570\u5b57\u3002\u7ed3\u679c\u4e3a27\u3002\u5728\u7b2c\u4e8c\u4e2a<code>+<\/code>\u8fd0\u7b97\u7b26\u4e2d\uff0c\u8be5\u8fd0\u7b97\u7b26\u5c06\u5b57\u7b26\u4e32\u89c6\u4e3a<code>\"3\"<\/code>\u4e00\u5143\u8fd0\u7b97\u7b26\uff08\u5e76\u7f6e\uff09\u3002\u8fd9\u5c06\u5f3a\u52369\u4ee5\u5b57\u7b26\u4e32<code>\"9\"<\/code>\u7684\u7ed3\u679c\u5f3a\u5236\u8f93\u51fa\u5230\u5b57\u7b26\u4e32<code>\"93\"<\/code>\u3002&nbsp;<\/p>\n\n\n\n<p>\u4e4d\u4e00\u770b\uff0c\u8fd9\u4f3c\u4e4e\u5f88\u65b9\u4fbf\uff0c\u4f46\u5b9e\u9645\u4e0a\u53ef\u80fd\u5bfc\u81f4\u4ee4\u4eba\u56f0\u60d1\u7684\u7ed3\u679c\u3002&nbsp;<\/p>\n\n\n\n<p><strong>\u4e0d\u8981\u4f7f\u7528\u9690\u5f0f\u5f3a\u5236<\/strong><\/p>\n\n\n\n<p>\u9690\u5f0f\u7c7b\u578b\u5f3a\u5236\u7684\u8bb8\u591a\u5b9e\u4f8b\u4ee4\u4eba\u56f0\u60d1\u3002\u4f8b\u5982\u5e03\u5c14\u6bd4\u8f83\u3002C\u7cfb\u5217\u8bed\u8a00\u5e38\u7528\u7684<code>==<\/code>&nbsp; and&nbsp;<code>!=<\/code>\u6bd4\u8f83\u8fd0\u7b97\u7b26\u5c06\u5c1d\u8bd5\u5c06\u4efb\u4f55\u5185\u5bb9\u8f6c\u6362\u4e3a\u5e03\u5c14\u503c\u3002\u6709\u786e\u5b9a\u6027\u7684\u89c4\u5219\uff0c\u4f46\u662f\u5b83\u4eec\u592a\u590d\u6742\u800c\u65e0\u6cd5\u5b9e\u9645\u5e94\u7528\u3002\u8fd9\u662f\u4e00\u4e9b\u6709\u8da3\u7684\u4f8b\u5b50\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>false == \"\"; \/\/ true\nfalse == \"0\"; \/\/ true\n\"\" == \"0\"; \/\/ false\n[0] == 0; \/\/ true<\/code><\/pre>\n\n\n\n<p>\u201c\u4e3a\u4ec0\u4e48\u8fd9\u6837\u505a\uff1f\u201d&nbsp;<\/p>\n\n\n\n<p>\u7a76\u7adf\u3002<\/p>\n\n\n\n<p>\u5bf9\u4e8e\u5e03\u5c14\u6bd4\u8f83\uff0c\u6700\u4f73\u5b9e\u8df5\u662f\u4f7f\u7528<code>===<\/code>\u548c<code>!==<\/code>\u3002\u4f7f\u7528\u8fd9\u4e9b\u8fd0\u7b97\u7b26\uff0c\u57fa\u672c\u7c7b\u578b\u4ec5\u5728\u7c7b\u578b\u548c\u503c\u90fd\u5339\u914d\u65f6\u624d\u7b49\u6548\uff0c\u5e76\u4e14\u5bf9\u8c61\u6bd4\u8f83\u4ec5\u5728\u5b83\u4eec\u5404\u81ea\u7684\u6307\u9488\u6307\u5411\u76f8\u540c\u7684\u5185\u5b58\u5730\u5740\u65f6\u624d\u4e3a\u771f\u3002\u5c1d\u8bd5\u4e0e\u4e0a\u8ff0\u76f8\u540c\u7684\u6bd4\u8f83\uff1a&nbsp;<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>false === \"\"; \/\/ false\nfalse === \"0\"; \/\/ false\n\"\" === \"0\"; \/\/ false\n[0] === 0; \/\/ false<\/code><\/pre>\n\n\n\n<p><strong>\u771f\u5047<\/strong><\/p>\n\n\n\n<p>\u60a8\u77e5\u9053\u6211\u4eec\u521a\u521a\u9488\u5bf9\u9690\u5f0f\u7c7b\u578b\u5f3a\u5236\u53d1\u51fa\u8b66\u544a\u7684\u89c4\u5219\u5417\uff1f\u597d\u5427\uff0c\u8fd9\u662f\u4e2a\u4f8b\u5916\u3002&nbsp;<\/p>\n\n\n\n<p>\u5f53\u8868\u8fbe\u5f0f\u671f\u671b\u5e03\u5c14\u503c\u65f6\uff0c\u4ee5\u4e0b\u503c\u59cb\u7ec8\u88ab\u89c6\u4e3afalse\u3002&nbsp;<\/p>\n\n\n\n<ul class=\"wp-block-list\"><li><code>false<\/code>&nbsp;\uff08\u5f53\u7136\uff09<\/li><li><code>0<\/code>&nbsp;\uff08\u6570\u5b57\u96f6\uff09<\/li><li><code>\"\"<\/code>\u6216<code>''<\/code>\uff08\u4e00\u4e2a\u7a7a\u5b57\u7b26\u4e32\uff09<\/li><li><code>null<\/code><\/li><li><code>undefined<\/code><\/li><li><code>NaN<\/code>&nbsp;\uff08\u6570\u5b66\u8fd0\u7b97\u5931\u8d25\u7684\u7ed3\u679c\uff09<\/li><\/ul>\n\n\n\n<p><code>false<\/code>\u662f<code>false<\/code>\uff08\u5f53\u7136\uff01\uff09\u3002\u8fd9\u4e9b\u503c\u7684\u5176\u4f59\u90e8\u5206\u88ab\u5f3a\u5236\u4e3a<code>false<\/code>\u3002\u4f5c\u4e3a\u4e00\u4e2a\u6574\u4f53\uff0c\u4ed6\u4eec\u88ab\u79f0\u4e3a<em>\u865a\u5047<\/em>\u3002&nbsp;<\/p>\n\n\n\n<p>\u6beb\u65e0\u7591\u95ee\uff0c<code>true<\/code>\u4ec5\u6b64\u800c\u5df2<code>true<\/code>\u3002\u4f46\u662f\u4efb\u4f55\u5176\u4ed6\u7c7b\u578b\u7684\u503c\u90fd\u88ab\u5f3a\u5236\u8f6c\u6362\u4e3a<code>true<\/code>\u3002\u6211\u4eec\u79f0\u8fd9\u4e9b\u4ef7\u503c\u89c2\u662f<em>\u771f\u5b9e\u7684<\/em>\u3002&nbsp;<\/p>\n\n\n\n<p>\u8fd9\u6709\u4e00\u4e2a\u65b9\u4fbf\u7684\u526f\u4f5c\u7528\u3002\u5047\u8bbe\u60a8\u8981\u901a\u8fc7\u7b80\u5355\u5730\u5c06\u53d8\u91cf\u4f20\u9012\u5230if\u8868\u8fbe\u5f0f\u4e2d\u6765\u6d4b\u8bd5\u51e0\u79cd\u7c7b\u578b\u7684\u65e0\u6548\u6570\u636e\u3002&nbsp;<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>const myRecord = response.getReturnValue();\nif (myRecord) {\n  \/\/now process the record\n}<\/code><\/pre>\n\n\n\n<p>\u5982\u679c\u7531\u4e8e\u67d0\u79cd\u539f\u56e0\u4e0a\u8ff0\u5206\u914d\u5931\u8d25\uff0c\u5e76\u4e14\u6211\u4eec\u6700\u7ec8\u5f97\u5230\u4e00\u4e2a\u672a\u521d\u59cb\u5316\u7684\u53d8\u91cf\uff08<code>undefined<\/code>\uff09\uff0c\u4e00\u4e2a\u7a7a\u5b57\u7b26\u4e32\u6216<code>0<\/code>\uff0c\u6211\u4eec\u4ec5\u901a\u8fc7\u5bf9\u8be5<code>myRecord<\/code>\u53d8\u91cf\u8fdb\u884c\u6761\u4ef6\u68c0\u67e5\u5c31\u8986\u76d6\u4e86\u6240\u6709\u8fd9\u4e9b\u57fa\u7840\u3002\u8fd9\u662fJavaScript\u4e2d\u5e7f\u6cdb\u63a5\u53d7\u7684\u505a\u6cd5\u3002&nbsp;<\/p>\n\n\n\n<p><strong><code>this<\/code>&nbsp;\u662f\u68d8\u624b\u7684<\/strong><\/p>\n\n\n\n<p>\u8be5\u6a21\u5757\u5305\u542b\u6709\u5173\u5982\u4f55\u4f7f\u7528<code>this<\/code>\u6307\u9488\u7684\u6574\u4e2a\u7ae0\u8282\u3002\u5b83\u5177\u6709\u5b9a\u4e49\u660e\u786e\u7684\u89c4\u5219\uff0c\u4f46\u662f<code>this<\/code>\u5373\u4f7f\u5728\u540c\u4e00\u529f\u80fd\u5185\uff0c\u6307\u5411\u7684\u5185\u5bb9\u4e5f\u53ef\u4ee5\u66f4\u6539\u3002\u4f8b\u5982\uff0c\u5728Apex\u7c7b\u4e2d\uff0c\u60a8\u53ef\u80fd\u4f1a\u770b\u5230\uff1a&nbsp;<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>public class MyApexClass {\n  private String subject;\n  public MyApexClass(String subject) {\n    this.subject  = subject;\n  }\n}<\/code><\/pre>\n\n\n\n<p>\u5728\u6b64\u793a\u4f8bApex\u7c7b\u4e2d\uff0c<code>this<\/code>\u4ec5\u5f15\u7528\u7684\u5f53\u524d\u5b9e\u4f8b<code>MyApexClass<\/code>\u3002\u5728JavaScript\u4e2d\uff0c<code>this<\/code>\u6307\u5411\u7684\u5185\u5bb9\u4e0d\u53d6\u51b3\u4e8e\u5b9a\u4e49\u51fd\u6570\u7684\u4f4d\u7f6e\uff0c\u800c\u662f\u53d6\u51b3\u4e8e\u8be5\u51fd\u6570\u7684<em>\u8c03\u7528\u4f4d\u7f6e<\/em>\u3002\u66f4\u591a\u5173\u4e8e<code>this<\/code>\u4ee5\u540e\u3002&nbsp;<\/p>\n\n\n\n<p><strong>\u529f\u80fd\u5c31\u662f\u4ef7\u503c<\/strong><\/p>\n\n\n\n<p>\u5728JavaScript\u4e2d\uff0c\u4e00\u5207\u90fd\u662f\u5bf9\u8c61\u3002\u8fd9\u4e5f\u9002\u7528\u4e8e\u529f\u80fd\u3002\u4e0e\u5176\u4ed6\u5bf9\u8c61\u4e00\u6837\uff0c\u53ef\u4ee5\u5c06\u51fd\u6570\u5206\u914d\u7ed9\u53d8\u91cf\uff0c\u5c06\u5176\u4f20\u9012\u7ed9\u5176\u4ed6\u51fd\u6570\u7684\u53c2\u6570\uff0c\u5e76\u4f7f\u7528\u4e0e\u5176\u4ed6\u4efb\u4f55\u5bf9\u8c61\u76f8\u540c\u7684\u65b9\u5f0f\u3002&nbsp;<\/p>\n\n\n\n<p>\u5982\u679c\u60a8\u672a\u4f7f\u7528\u51fd\u6570\u662f\u4e00\u7b49\u516c\u6c11\u6216\u4f7f\u7528lambda\u7684\u8bed\u8a00\uff0c\u8fd9\u53ef\u80fd\u4f1a\u6709\u4e9b\u4ee4\u4eba\u9707\u60ca\u3002\u7a0d\u540e\uff0c\u6211\u4eec\u5c06\u6574\u4e2a\u5355\u5143\u7528\u4e8e\u529f\u80fd\u4e0a\u3002&nbsp;<\/p>\n\n\n\n<p>\u6b64\u540e\uff0c\u8fd8\u6709\u66f4\u591a\u5176\u4ed6\u4e8b\u60c5\u3002&nbsp;<\/p>\n\n\n\n<p>\u73b0\u5728\uff0c\u60a8\u5df2\u7ecf\u5bf9JavaScript\u6982\u5ff5\u6709\u4e86\u5f88\u597d\u7684\u57fa\u672c\u4ecb\u7ecd\u3002\u63a5\u4e0b\u6765\uff0c\u6211\u4eec\u6765\u770b\u4e00\u4e0bJavaScript\u5728\u6d4f\u89c8\u5668\u4e2d\u7684\u5de5\u4f5c\u65b9\u5f0f\u3002<\/p>\n\t\t","protected":false},"excerpt":{"rendered":"<p>\u5b66\u4e60\u76ee\u6807 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