{"id":97,"date":"2020-12-30T23:08:58","date_gmt":"2020-12-30T15:08:58","guid":{"rendered":"http:\/\/qqiuklele.cn\/?p=97"},"modified":"2025-03-26T15:20:41","modified_gmt":"2025-03-26T07:20:41","slug":"javascript%e7%9a%84%e9%97%ad%e5%8c%85%e5%8e%9f%e7%90%86%e5%8f%8a%e4%bd%bf%e7%94%a8%e5%9c%ba%e6%99%af","status":"publish","type":"post","link":"https:\/\/qqiukulele.cn\/?p=97","title":{"rendered":"JavaScript\u7684\u95ed\u5305\u539f\u7406\u53ca\u4f7f\u7528\u573a\u666f"},"content":{"rendered":"\n

\u4ecb\u7ecd\u95ed\u5305\u524d\u9700\u8981\u4e86\u89e3\u7684<\/h2>\n\n\n\n

\u521a\u5f00\u59cb\u5b66\u4e60\u95ed\u5305\uff0c\u6700\u7ecf\u5e38\u542c\u5230\u63cf\u8ff0\u95ed\u5305\u7684\u4e00\u53e5\u8bdd\u5c31\u662f\uff1a\u201c\u4e00\u4e2a\u51fd\u6570\u8fd4\u56de\u53e6\u4e00\u4e2a\u51fd\u6570\uff0c\u8ba9\u4f60\u53ef\u4ee5\u5728\u4e00\u4e2a\u5185\u5c42\u51fd\u6570\u4e2d\u8bbf\u95ee\u5230\u5176\u5916\u5c42\u51fd\u6570\u7684\u4f5c\u7528\u57df\u3002\u201d\u8fd9\u53e5\u8bdd\u6ca1\u6bdb\u75c5\u7684\uff0c\u751a\u81f3\u5f88\u76f4\u89c2\u5730\u6307\u51fa\u4e86\u95ed\u5305\u7684\u5f62\u5f0f\u3002\u95ed\u5305\u5c31\u662f\u4e00\u4e2a\u4e3a\u4e86\u91cd\u7528\u5bf9\u8c61\uff0c\u53c8\u4fdd\u62a4\u5bf9\u8c61\u4e0d\u88ab\u7be1\u6539\u7684\u673a\u5236\u3002<\/p>\n\n\n\n

\u5728JavaScript\u4e2d\uff0c\u5982\u679c\u5728\u51fd\u6570\u5916\u76f4\u63a5\u8bbf\u95ee\u51fd\u6570\u5185\u90e8\u5b9a\u4e49\u7684\u53d8\u91cf\uff0c\u662f\u4f1a\u62a5\u9519\u7684\u3002\u5982\u4e0b\u9762\u7684\u4ee3\u7801\u7684\u9519\u8bef\u63d0\u793a\u5c31\u662f\uff1aCannot access ‘num’ before initialization.<\/p>\n\n\n\n

function aaa() {
    let num = 0;
    num++;
    console.log(num); \/\/\u221a
}
console.log(num);\/\/\u00d7<\/pre>\n\n\n\n
V8\u5f15\u64ce\u89e3\u6790\u4ee3\u7801\u7684\u5de5\u4f5c\u539f\u7406<\/h3>\n\n\n\n
\u4e0a\u9762\u7684\u4ee3\u7801\uff0c\u53ef\u4ee5\u7528V8\u5f15\u64ce\u89e3\u6790\u4ee3\u7801\u7684\u5de5\u4f5c\u539f\u7406\u8bb2\u4e00\u8bb2\u3002\u9996\u5148\uff0c\u5f15\u64ce\u4f1a\u5728\u5185\u5b58\u4e2d\u5148\u521b\u5efa\u4e00\u4e2a\u6267\u884c\u73af\u5883\u6808\uff0c\u7136\u540e\u628awindow\u5bf9\u8c61\u653e\u5165\u6808\u4e2d\uff0c\u5168\u5c40\u51fd\u6570aaa\u4f5c\u4e3awindow\u5bf9\u8c61\u7684\u65b9\u6cd5\u88ab\u521b\u5efa\uff0c\u540c\u65f6\u8fd9\u4e2awindow\u5bf9\u8c61\u4e5f\u653e\u8fdb\u4e86\u4f5c\u7528\u57df\u94fe\u4e2d\u3002\u5f53\u6211\u4eec\u8c03\u7528\u8fd9\u4e2a\u5168\u5c40\u51fd\u6570\u7684\u65f6\u5019\uff0c\u5c31\u5728\u6267\u884c\u73af\u5883\u6808\u91cc\u8c03\u7528\u4e86\u8fd9\u4e2a\u65b9\u6cd5\uff0c\u5e76\u4f1a\u4e3a\u8fd9\u4e2a\u51fd\u6570\u4e34\u65f6\u751f\u6210\u4e00\u4e2a\u6d3b\u52a8\u5bf9\u8c61AO\uff08activation object\uff09(AO\u5305\u542b\u4e86\u51fd\u6570\u6240\u6709\u7684\u5c40\u90e8\u53d8\u91cf\u3001\u53c2\u6570\u4ee5\u53cathis)\uff0c\u6267\u884c\u5b8c\u51fd\u6570\u540e\u53c8\u7acb\u5373\u9500\u6bc1\u6389AO\uff0c\u51fd\u6570\u4e5f\u51fa\u6808\u3002\u5728\u672a\u5173\u6389\u6d4f\u89c8\u5668\u524d\uff0c\u5168\u5c40\u53d8\u91cf\u8fd8\u662f\u5728\u7684\u3002\u4f46\u662f\u51fd\u6570\u51fa\u6808\u4e86\uff0c\u6d3b\u52a8\u5bf9\u8c61\u88ab\u9500\u6bc1\u4e86\uff0c\u51fd\u6570\u91cc\u7684\u53d8\u91cf\u7684\u4e0d\u518d\u88ab\u5f15\u7528\uff0c\u5c31\u88ab\u5783\u573e\u56de\u6536\u6389\u4e86\u3002\u6211\u4eec\u5c31\u5728\u51fd\u6570\u5916\u8bbf\u95ee\u4e0d\u5230num\u3002\u8fd9\u5c31\u662f\u6211\u4eec\u5728\u51fd\u6570\u91cc\u5b9a\u4e49\u7684\u5c40\u90e8\u53d8\u91cf\u4e0d\u53ef\u91cd\u7528\u7684\u539f\u56e0\uff0c\u8fd9\u4e5f\u662f\u95ed\u5305\u9700\u8981\u51fa\u73b0\u7684\u539f\u56e0\u3002\uff08\u5e94\u8be5\u662f\u8fd9\u6837?\uff09<\/p>\n\n\n\n
\u4f5c\u7528\u57df\u548c\u4f5c\u7528\u57df\u94fe<\/h3>\n\n\n\n
\u8bf4\u5230\u8fd9\u91cc\u4e5f\u4e0d\u5f97\u4e0d\u63d0\u4f5c\u7528\u57df\u548c\u4f5c\u7528\u57df\u94fe\u3002\u6bcf\u4e2a\u51fd\u6570\u90fd\u6709\u81ea\u5df1\u7684\u6267\u884c\u73af\u5883\uff0c\u5f53\u4ee3\u7801\u5728\u73af\u5883\u4e2d\u6267\u884c\u65f6\uff0c\u4f1a\u521b\u5efa\u53d8\u91cf\u5bf9\u8c61\u7684\u4e00\u4e2a\u4f5c\u7528\u57df\u3002\u800c\u4f5c\u7528\u57df\u94fe\uff0c\u5c31\u662f\u7531\u5f53\u524d\u73af\u5883\u4e0e\u4e0a\u5c42\u73af\u5883\u7684\u4e00\u7cfb\u5217\u53d8\u91cf\u5bf9\u8c61\u7ec4\u6210\uff0c\u5b83\u4fdd\u8bc1\u4e86\u5f53\u524d\u6267\u884c\u73af\u5883\u5bf9\u7b26\u5408\u8bbf\u95ee\u6743\u9650\u7684\u53d8\u91cf\u548c\u51fd\u6570\u7684\u6709\u5e8f\u8bbf\u95ee\u3002<\/strong>\u4f5c\u7528\u57df\u7684\u524d\u7aef\uff0c\u59cb\u7ec8\u662f\u5f53\u524d\u6267\u884c\u7684\u4ee3\u7801\u6240\u5728\u7684\u73af\u5883\u7684\u53d8\u91cf\u5bf9\u8c61\u3002\u4f5c\u7528\u57df\u94fe\u4e2d\u7684\u4e0b\u4e00\u4e2a\u53d8\u91cf\u5bf9\u8c61\u6765\u81ea\u5916\u90e8\u73af\u5883\uff0c\u76f4\u5230\u6700\u540e\u4e00\u4e2a\u5168\u5c40window\u5bf9\u8c61\u4f5c\u4e3a\u4f5c\u7528\u57df\u94fe\u7684\u7ed3\u675f\u3002\u641c\u7d22\u8fc7\u7a0b\u4ece\u4f5c\u7528\u57df\u524d\u7aef\u5f00\u59cb\uff0c\u4e00\u7ea7\u4e00\u7ea7\u7f51\u4e0a\u627e\uff0c\u627e\u4e0d\u5230\u5c31\u505c\u6b62\u548c\u8fd4\u56deundefined\u3002\u5728\u4e0a\u9762\u7684\u4f8b\u5b50\u4e2d\uff0c\u51fd\u6570\u91cc\u7684num\u4e00\u4e0b\u5c31\u88ab\u8bbf\u95ee\u5230\u4e86\u3002<\/p>\n\n\n\n
\u95ed\u5305\u662f\u4ec0\u4e48\uff1f<\/h2>\n\n\n\n
\u6211\u53ef\u4ee5\u6539\u4e0b\u4e00\u4e0b\u4e0a\u9762\u7684\u4f8b\u5b50\uff0c\u5199\u6210\u4e00\u4e2a\u95ed\u5305\u7684\u5f62\u5f0f\uff0c\u7136\u540e\u91cd\u70b9\u770b\u770b\u8f93\u51fa\u4ec0\u4e48\u3002<\/p>\n\n\n\n
function a() {
    let num = 0;
    num++;
    return function getNum(){  \/\/\u8fd4\u56de\u4e00\u4e2a\u51fd\u6570
       return num;  \/\/\u5728\u8fd9\u4e2a\u51fd\u6570\u91cc\u8fd4\u56de\u8fd9\u4e2a\u53d8\u91cf
    }
}
    let number = a();
    console.dir(number);\/\/\u663e\u793anumber\u5bf9\u8c61\u7684\u6240\u6709\u5c5e\u6027\u548c\u65b9\u6cd5<\/pre>\n\n\n\n
\"\"\/<\/div><\/figure>\n\n\n\n
[[scopes]]\u5c31\u662f\u6211\u4eec\u7684\u4f5c\u7528\u57df\uff0c\u4ed6\u663e\u793a\u7740Closure\u91cc\u5b58\u7740\u4e00\u4e2anum:1\u7684\u53d8\u91cf\u3002\u4e5f\u5c31\u662f\u6211\u4eec\u901a\u8fc7\u8fd4\u56de\u4e00\u4e2a\u51fd\u6570\u7684\u95ed\u5305\u5f62\u5f0f\uff0c\u987a\u5229\u5730\u628a\u51fd\u6570\u5916\u90e8\u7684\u53d8\u91cf\u4fdd\u5b58\u4e86\u8d77\u6765\u3002<\/p>\n\n\n\n
\u8fd8\u662f\u5148\u8bf4\u8bf4\u600e\u4e48\u56de\u7b54\u95ed\u5305\u662f\u4ec0\u4e48\u5427\uff1f<\/p>\n\n\n\n
\u95ed\u5305\u662f\u6307\u6709\u6743\u8bbf\u95ee\u53e6\u4e00\u4e2a\u51fd\u6570\u4f5c\u7528\u57df\u4e2d\u7684\u53d8\u91cf\u7684\u51fd\u6570\u3002\u7236\u51fd\u6570\u5c06\u5b50\u51fd\u6570\u4f5c\u4e3a\u8fd4\u56de\u503c\uff0c\u518d\u5c06\u5b50\u51fd\u6570\u8d4b\u503c\u7ed9\u4e00\u4e2a\u53d8\u91cf\uff0c\u6240\u4ee5\u5b50\u51fd\u6570\u5c31\u4f1a\u5b58\u5728\u4e8e\u5185\u5b58\u5f53\u4e2d\uff0c\u800c\u5b50\u51fd\u6570\u4f9d\u8d56\u4e8e\u7236\u51fd\u6570\u5b58\u5728\uff0c\u6240\u4ee5\u7236\u51fd\u6570\u4e5f\u5b58\u5728\u5185\u5b58\u5f53\u4e2d\uff0c\u4e5f\u5c31\u4e0d\u4f1a\u88ab\u5783\u573e\u56de\u6536\u673a\u5236<\/strong>\u56de\u6536\u3002\u4ed6\u8ba9\u53d8\u91cf\u6210\u4e3a\u4e0d\u53ef\u91ca\u653e\u7684\u5f15\u7528<\/strong>\uff0c\u505a\u5230\u4e86\u5ef6\u957f\u53d8\u91cf\u7684\u751f\u547d\u5468\u671f<\/strong>\u3002<\/p>\n\n\n\n
\u518d\u8bf4\u4e00\u4e2a\u8d85\u7ea7\u8d85\u7ea7\u5e38\u89c1\u7684\u4f8b\u5b50\uff0c\u5c31\u662ffor\u5faa\u73af\u6253\u5370\u3002<\/p>\n\n\n\n
for (var i = 0; i < 4; i++) {  \/\/\u5f53\u7136\uff0c\u6539\u5199let\u5c31\u4e0d\u4e00\u6837\u4e86
  setTimeout(function() {
    console.log(i);
  }, 300);
}<\/pre>\n\n\n\n
\u7ed3\u679c\u90fd\u662f4\u4e2a4\uff0c\u4e0d\u662f0\uff0c1\uff0c2\uff0c3.\u9996\u5148\uff0c\u8fd9\u4e2ai\u5f15\u7528\u7684\u90fd\u662f\u540c\u4e00\u4e2a\u53d8\u91cfi\u3002\u5176\u6b21\uff0csetTimeout\u7684\u6267\u884c\u6d89\u53ca\u5230\u4e8b\u4ef6\u5faa\u73af\u673a\u5236\uff0c\u4ed6\u4f1a\u7b49\u5f85\u5b8f\u4efb\u52a1\u961f\u5217\u548c\u5fae\u4efb\u52a1\u961f\u5217\u6e05\u7a7a\u540e\u624d\u6267\u884c\u3002\u7136\u9e45\uff0c\u8fd9\u4e2afor\u5faa\u73af\u6267\u884c\u7684\u975e\u5e38\u5feb\uff0c\u80af\u5b9a\u57280.3\u79d2\u5185\u6267\u884c\u5b8c\u4e86\u3002\u4ee5\u81f3\u4e8esetTimeout\u5230\u70b9\u6267\u884c\u7684\u65f6\u5019\uff0c\u6253\u5370\u7684i\u5f15\u7528\u7684\u503c\u90fd\u662ffor\u5faa\u73af\u6267\u884c\u540e\u76844\u4e86\u3002<\/p>\n\n\n\n
\u8fd9\u65f6\u5019\u6211\u4eec\u53ef\u4ee5\u521b\u5efa\u95ed\u5305\uff0c\u8ba9\u95ed\u5305\u4fdd\u5b58\u4e00\u4e2a\u81ea\u5df1i\u53d8\u91cf\u526f\u672c\u3002<\/p>\n\n\n\n
for (var i = 0; i < 4; i++) {
            setTimeout(
                (function (i) {
                    return function () {\/\/\u6bcf\u6b21\u5f62\u6210\u7684\u95ed\u5305\u4e92\u4e0d\u5f71\u54cd
                        console.log(i);  \/\/\u4fdd\u5b58\u4e86\u5bf9\u5e94\u7684\u503c
                    };
                })(i),\/\/\u4f20\u53c2\u81ea\u6267\u884c
                300
            );
        }
        \/\/ \u6216\u8005
        for (var i = 0; i < 4; i++) {
            setTimeout(
                (function () {
                    var temp = i;
                    return function () {
                        console.log(temp);
                    };
                })(),
                300
            );
        }<\/pre>\n\n\n\n
\u5c3d\u7ba1setTimeout\u5728\u7b49\u5f85\u7740\u88ab\u6267\u884c\uff0c\u4f46\u662f\u7531\u4e8e\u95ed\u5305\u7684\u4f5c\u7528\uff0c\u4ed6\u4eec\u643a\u5e26\u7740\u7684\u662f\u53d8\u91cf\u503c\u90fd\u662ffor\u5faa\u73af\u91cc\u5bf9\u5e94\u7684i\u7684\u503c\u4e86\u3002<\/p>\n\n\n\n
\u95ed\u5305\u7684\u4f7f\u7528<\/h2>\n\n\n\n
\u4e8b\u4ef6\u9632\u6296<\/h3>\n\n\n\n
\u8fd9\u4e2a\u4f8b\u5b50\u4f53\u73b0\u4e86\u4e8b\u4ef6\u9632\u6296\uff0c\u5c31\u662f\u8f93\u5165\u6846\u505c\u6b62\u8f93\u5165\u540e\u7684\u4e00\u79d2\uff0c\u624d\u4f1a\u6267\u884c\u51fd\u6570\uff08\u53d1\u8d77\u8bf7\u6c42\u7b49\u7b49\uff09\uff0c\u8fd9\u6837\u907f\u514d\u4e86\u5927\u91cf\u7684\u65e0\u4e3a\u8bf7\u6c42\u3002<\/p>\n\n\n\n
\/\/\u7b2c\u4e00\u4e2a\u7b80\u5355\u5e94\u7528\uff1a\u4e8b\u4ef6\u9632\u6296
        function antiShake(fn, wait) {
            let timeOut = null;  \/\/\u5f53\u6211\u8f93\u5165\u7684\u65f6\u5019\u6ca1\u6709\u8d85\u8fc7\u4e00\u79d2\uff0c\u5c31\u4e0d\u4f1a\u89e6\u53d1
            return args => {   \/\/\u8fd0\u7528\u5230\u4e00\u4e2a\u95ed\u5305
                if (timeOut) clearTimeout(timeOut);
                timeOut = setTimeout(fn, wait)
            }
\u200b
        }
        function demo2() {
            console.log(\"\u8bf7\u6c42\u6570\u636e\");
        }
        let telInput = document.querySelector(\"input\");
        telInput.addEventListener('input', antiShake(demo2, 1000));   \/\/\u6bcf\u9694\u4e00\u79d2\u6267\u884c\u4e00\u6b21<\/pre>\n\n\n\n
\u7528\u95ed\u5305\u6a21\u62df\u79c1\u6709\u65b9\u6cd5\u6216\u79c1\u6709\u5c5e\u6027<\/h3>\n\n\n\n
\u5728\u9762\u5411\u5bf9\u8c61\u7684\u8bed\u8a00\u4e2d\uff0c\u51e0\u4e4e\u90fd\u6709\u7c7b\uff0c\u7c7b\u5c31\u8981\u79c1\u6709\u5c5e\u6027\u548c\u65b9\u6cd5\u3002\u53ea\u80fd\u88ab\u540c\u4e00\u4e2a\u7c7b\u4e2d\u7684\u5176\u4ed6\u65b9\u6cd5\u6240\u8c03\u7528\uff0c\u4e0d\u4f1a\u88ab\u5916\u90e8\u5f15\u7528\uff0c\u4e0d\u88ab\u6c61\u67d3\u7684\u5c31\u662f\u79c1\u6709\u5c5e\u6027\u6216\u8005\u65b9\u6cd5\u3002\u867d\u7136JavaScript\u6ca1\u6709\u7c7b\uff0c\u4f46\u662f\u7528\u95ed\u5305\u53ef\u4ee5\u6a21\u62df\u8fd9\u4e2a\u7279\u6027\u3002<\/p>\n\n\n\n
let makeCounter = function () {
            let privateCounter = 0;
            function changeBy(val) {\/\/\u79c1\u6709\u65b9\u6cd5
                privateCounter += val;
            }
            return {
                increment: () => {
                    changeBy(1);
                },
                decrement: () => {
                    changeBy(-1);
                },
                getValue: () => {
                    return privateCounter;
                }
            }
        }
        let counter1 = makeCounter();\/\/\u521b\u5efa\u4e24\u4e2a\u8ba1\u6570\u5668\uff0c\u5404\u81ea\u4fdd\u6301\u72ec\u7acb\uff0c\u6bcf\u4e2a\u95ed\u5305\u5f15\u7528\u7684\u90fd\u662f\u81ea\u5df1\u8bcd\u6cd5\u73af\u5883\u7684\u53d8\u91cf\u3002
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        let counter2 = makeCounter();
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