\u89c4\u683c\u6587\u4ef6\uff1ahttp:\/\/ecma-international.org\/ecma-262\/6.0\/<\/p>\n
1 let
\n\u4e0d\u5b58\u5728\u53d8\u91cf\u63d0\u5347
\n\u6682\u65f6\u6027\u6b7b\u533a tdz
\n\u4e0d\u5141\u8bb8\u91cd\u590d\u58f0\u660e<\/p>\n
2 \u53d8\u91cf\u63d0\u5347
\n[javascript]
\nvar tmp = new Date();
\nfunction f(){
\nconsole.log(tmp);
\nif(false){
\nvar tmp = "Hello world!";
\n}
\n}
\nf(); \/\/ undefined
\n[\/javascript]<\/p>\n
3 const\u5b9a\u4e49\u4e4b\u540e\u503c\u4e0d\u80fd\u53d8\uff0c\u4f46\u662f
\n[javascript]
\nconst foo = {};
\nfoo.prop = 123; \/\/ \u53ef\u4ee5<\/p>\n
const foo = Object.freeze({});
\nfoo.prop = 123; \/\/ \u4e0d\u8d77\u4f5c\u7528<\/p>\n
const a = [];
\na.push("Hello"); \/\/ \u53ef\u4ee5
\na.length = 0; \/\/ \u53ef\u4ee5
\na = ['Dave']; \/\/ \u62a5\u9519
\n[\/javascript]<\/p>\n
4 ES6\u58f0\u660e\u53d8\u91cf6\u79cd\u65b9\u5f0f
\nvar
\nfunction
\nlet
\nconst
\nimport
\nclass<\/p>\n
let\u3001const\u3001class\u58f0\u660e\u7684\u5168\u5c40\u53d8\u91cf\u4e0d\u662f\u5168\u5c40\u5bf9\u8c61\u7684\u5c5e\u6027<\/p>\n
5 \u89e3\u6784\u8d4b\u503c
\n[javascript]
\nlet [foo, [[bar], baz]] = [1, [[2], 3]];
\nlet [x, , y] = [1, 2, 3];
\nlet [x, ...y] = [1, 2, 3, 4];
\nlet [x, y, ...z] = ["a"];<\/p>\n
\/\/ \u9ed8\u8ba4\u503c\u662f\u8868\u8fbe\u5f0f\uff0c\u8868\u8fbe\u5f0f\u662f\u60f0\u6027\u6c42\u503c\u7684
\nlet [x = f()] = [1]; \/\/ f()\u4e0d\u6267\u884c<\/p>\n
\/\/ \u5bf9\u8c61\u7684\u89e3\u6784\u8d4b\u503c
\nvar {foo, bar} = {foo:'aaa', bar: 'bbb'};
\nvar {foo: baz} = {foo:'aaa', bar: 'bbb'};
\nbaz \/\/ 'aaa'<\/p>\n
\u6a21\u5f0f\u4e0d\u4f1a\u88ab\u8d4b\u503c
\n\u4f7f\u7528\u62ec\u5f27\u907f\u514dJavaScript\u5c06{}\u89e3\u6790\u4e3a\u4ee3\u7801\u5757<\/p>\n
\/\/\u5b57\u7b26\u7684\u89e3\u6784\u8d4b\u503c
\nlet {length:len} = 'hello';
\n[\/javascript]<\/p>\n","protected":false},"excerpt":{"rendered":"
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