![\"\"](\"http:\/\/zhuxinyong.com\/wp-content\/uploads\/2022\/06\/16543281843089.jpg\")
<\/p>\n<\/p>\n
\u539f\u6587\uff1ahttps:\/\/dev.to\/bhagatparwinder\/arrow-function-basics-34cm<\/a><\/p>\n \u7bad\u5934\u51fd\u6570\u662f\u5728 ES6 \u5f15\u5165\u7684\uff0c\u76f8\u5bf9\u4e8e\u51fd\u6570\u8868\u8fbe\u5f0f\u6765\u8bf4\u662f\u4e00\u79cd\u66f4\u7b80\u6d01\u7684\u65b9\u5f0f\u3002<\/p>\n \u7bad\u5934\u51fd\u6570\u540d\u79f0\u7684\u6765\u6e90\u662f\u56e0\u4e3a\u4f7f\u7528\u4e86 \u8fd9\u4e2a\u60c5\u5f62\u7684\u552f\u4e00\u9677\u9631\u662f\u5f53\u53ea\u6709\u4e00\u4e2a\u53c2\u6570\u4e14\u9700\u8981\u89e3\u6784\u65f6\uff1a<\/p>\n \u73b0\u5728\u6211\u4eec\u77e5\u9053\u4e86\u6240\u6709\u7684\u5173\u952e\u7279\u70b9\uff0c\u8ba9\u6211\u4eec\u6765\u91cd\u5199\u83b7\u53d6\u6b63\u65b9\u5f62\u7684\u9762\u79ef\uff1a<\/p>\n JavaScript \u4e2d\u7684 this \u5173\u952e\u5b57\u662f\u6267\u884c\u4e0a\u4e0b\u6587\u7684\u4e00\u4e2a\u5c5e\u6027\uff0c\u5b83\u53ef\u80fd\u662f\u5168\u5c40\u7684\u3001\u51fd\u6570\u5185\u7684\u6216\u8005\u662f eval \u4e2d\u7684\u3002\u5bf9\u4e8e\u666e\u901a\u7684\u51fd\u6570\uff0cthis \u4f1a\u6839\u636e\u8c03\u7528\u5b83\u65b9\u5f0f\u4e0d\u540c\u800c\u53d8\u5316\u3002<\/p>\n \u6211\u4eec\u4f7f\u7528\u8fd9\u79cd\u884c\u4e3a\u5df2\u7ecf\u5f88\u4e45\u4e86\uff0c\u4ee5\u81f3\u4e8e\u5927\u591a\u6570JavaScript\u5f00\u53d1\u8005\u90fd\u5df2\u7ecf\u4e60\u60ef\u4e86\u3002<\/p>\n \u4e0a\u9762\u7684\u4f8b\u5b50\u4e2d\uff0cthis \u6307\u5411 myObject,\u53ef\u4ee5\u83b7\u53d6\u5b83\u4e0a\u9762\u7684\u5c5e\u6027\u3002<\/p>\n \u539f\u6587\uff1ahttps:\/\/dev.to\/bhagatparwinder\/arrow-function-b...<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[249,2,20,3],"tags":[137,135],"class_list":["post-1248","post","type-post","status-publish","format-standard","hentry","category-javascript","category-all","category-frontend","category-tech","tag-arrow-function","tag-js-parwinder"],"_links":{"self":[{"href":"https:\/\/zhuxinyong.com\/index.php?rest_route=\/wp\/v2\/posts\/1248","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/zhuxinyong.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/zhuxinyong.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/zhuxinyong.com\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/zhuxinyong.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=1248"}],"version-history":[{"count":3,"href":"https:\/\/zhuxinyong.com\/index.php?rest_route=\/wp\/v2\/posts\/1248\/revisions"}],"predecessor-version":[{"id":1252,"href":"https:\/\/zhuxinyong.com\/index.php?rest_route=\/wp\/v2\/posts\/1248\/revisions\/1252"}],"wp:attachment":[{"href":"https:\/\/zhuxinyong.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=1248"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/zhuxinyong.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=1248"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/zhuxinyong.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=1248"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}<\/span><\/a>\u7b80\u4ecb<\/h2>\n
=><\/code>\u3002<\/p>\n<\/span><\/a>\u8bed\u6cd5<\/h3>\n
const functionName = (arg1, arg2, ... argN) => {\n return value;\n}\n<\/code><\/pre>\n<\/span><\/a>\u4f8b\u5b50<\/h3>\n
const multiply = (a, b) => {\n return a * b;\n}\n\nconsole.log(multiply(7, 8)); \/\/ 56\nconsole.log(multiply(3, 2)); \/\/ 6\n<\/code><\/pre>\n<\/span><\/a>\u5173\u952e\u7279\u70b9<\/h3>\n
\n
const square = x => {\n return x * x;\n }\n\n console.log(square(2)); \/\/ 4\n console.log(square(7)); \/\/ 49\n<\/code><\/pre>\n const foo = ({name = "New User"}) => name;\n \n console.log(foo({})); \/\/ New User\n console.log(foo({name: "Parwinder"})); \/\/ Parwinder\n<\/code><\/pre>\n\n
const greeting = () => {\n return "Hello World!";\n }\n\n console.log(greeting()); \/\/ Hello World!\n<\/code><\/pre>\n\n
const greeting = () => "Hello World!";\n console.log(greeting()); \/\/ Hello World\n<\/code><\/pre>\nconst square = x => x * x;\nconsole.log(square(4)); \/\/ 16\n<\/code><\/pre>\n<\/span><\/a>this \u5173\u952e\u5b57<\/h2>\n
![\"\"](\"http:\/\/zhuxinyong.com\/wp-content\/uploads\/2022\/06\/16543364837909.jpg\")
<\/p>\n<\/span><\/a>this \u5173\u952e\u5b57\u548c\u51fd\u6570<\/h3>\n
\n
<\/span><\/a>\u51fd\u6570\u76f4\u63a5\u8c03\u7528\uff0cthis \u4ee3\u8868\u5168\u5c40\u5bf9\u8c61<\/h3>\n
function foo() {\n return this;\n};\n\nconsole.log(foo()); \/\/ window object in a browser, global object for node execution\n<\/code><\/pre>\n<\/span><\/a>\u7528\u5728\u6784\u9020\u51fd\u6570\u4e2d\uff0cthis \u4ee3\u8868\u4e00\u4e2a\u65b0\u5bf9\u8c61<\/h3>\n
function Order(main, side, dessert) {\n this.main = main;\n this.side = side;\n this.dessert = dessert;\n this.order = function () {\n return `I will have ${this.main} with ${this.side} and finish off with a ${this.dessert}`;\n }\n}\nconst newOrder = new Order("sushi", "soup", "yogurt");\n\nconsole.log(newOrder.order());\n\/\/ I will have sushi with soup and finish off with a yogurt\n<\/code><\/pre>\n<\/span><\/a>\u5f53\u51fd\u6570\u4f5c\u4e3a\u4e00\u4e2a\u5bf9\u8c61\u7684\u65b9\u6cd5\u88ab\u8c03\u7528\uff0cthis \u5c31\u4ee3\u8868\u90a3\u4e2a\u5bf9\u8c61<\/h3>\n
const myObject = {\n main: "butter chicken",\n side: "rice",\n dessert: "ice cream",\n order: function () {\n return `I will have ${this.main} with ${this.side} and finish off with ${this.dessert}`;\n }\n}\n\nconsole.log(myObject.order());\n\/\/ I will have butter chicken with rice and finish off with ice cream\n<\/code><\/pre>\n<\/span><\/a>\u5728\u4e25\u683c\u6a21\u5f0f\u4e0b\uff0c this \u7684\u503c\u4e3a undefined<\/h3>\n
"use strict";\nfunction foo() {\n return this;\n};\n\nconsole.log(foo() === undefined); \/\/ true\n<\/code><\/pre>\n<\/span><\/a>\u5728\u4e8b\u4ef6\u4e2d\uff0cthis \u6307\u5411\u63a5\u6536\u5230\u4e8b\u4ef6\u7684\u5143\u7d20<\/h3>\n
<!DOCTYPE html>\n<html lang="en">\n<head>\n <meta content="text\/html;charset=utf-8" http-equiv="Content-Type">\n <meta content="utf-8" http-equiv="encoding">\n<\/head>\n<body>\n <button id="mybutton">\n Click me!\n <\/button>\n <script>\n var element = document.querySelector("#mybutton");\n element.addEventListener('click', function (event) {\n console.log(this); \/\/ Refers to the button clicked\n console.log(this.id); \/\/ mybutton\n }, false);\n <\/script>\n<\/body>\n<\/html>\n<\/code><\/pre>\n![\"\u524d\u7aef\u9ed1\u677f\u62a5\"](\"http:\/\/zhuxinyong.com\/wp-content\/uploads\/2022\/06\/\u524d\u7aef\u9ed1\u677f\u62a5-2.jpg\")
<\/p>\n","protected":false},"excerpt":{"rendered":"