{"id":2606,"date":"2022-12-14T19:48:33","date_gmt":"2022-12-14T11:48:33","guid":{"rendered":"https:\/\/qaqaq.top\/?p=2606"},"modified":"2022-12-14T19:48:33","modified_gmt":"2022-12-14T11:48:33","slug":"javascript-let%e3%80%81const%e4%b8%8evar%e7%9a%84%e5%8c%ba%e5%88%ab","status":"publish","type":"post","link":"https:\/\/qaqaq.top\/?p=2606","title":{"rendered":"JavaScript let\u3001const\u4e0evar\u7684\u533a\u522b"},"content":{"rendered":"\n<h2 class=\"wp-block-heading\">\u4e00\u3001\u5b9a\u4e49<\/h2>\n\n\n\n<p>let\u548cconst\u662fES6\u65b0\u589e\u7684\u58f0\u660e\u53d8\u91cf\u7684\u5173\u952e\u8bcd\uff0c\u4e4b\u524d\u58f0\u660e\u53d8\u91cf\u7684\u5173\u952e\u8bcd\u662fvar\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">\u4e8c\u3001let<\/h2>\n\n\n\n<p>var\u5b9a\u4e49\u7684\u53d8\u91cf\uff0c\u53ef\u4ee5\u9884\u89e3\u6790\u63d0\u524d\u8c03\u7528\u7684\u7ed3\u679c\u662fundefined\uff0clet\u5b9a\u4e49\u7684\u53d8\u91cf\u4e0d\u80fd\u9884\u89e3\u6790\uff0c\u63d0\u524d\u8c03\u7528\u7684\u7ed3\u679c\u662f \u62a5\u9519\u3002<br>var\u5b9a\u4e49\u7684\u53d8\u91cf\uff0c\u53d8\u91cf\u540d\u79f0\u53ef\u4ee5\u91cd\u590d\uff0c\u6548\u679c\u662f\u91cd\u590d\u8d4b\u503c\uff0clet\u5b9a\u4e49\u7684\u53d8\u91cf\u4e0d\u80fd\u91cd\u590d\uff0c\u5426\u5219\u6267\u884c\u62a5\u9519\u3002<br>var\u5b9a\u4e49\u7684\u53d8\u91cf\u4f5c\u7528\u57df\u662f\u5168\u5c40\/\u5c40\u90e8\u4f5c\u7528\u57df\u3002let\u5b9a\u4e49\u7684\u53d8\u91cf\u5982\u679c\u5728{}\u4e2d\u53ea\u80fd\u5728{}\u4e2d\u8c03\u7528\u3002<br>\u5728\u5faa\u73af\u8bed\u53e5\u4e2dvar\u5b9a\u4e49\u7684\u5faa\u73af\u53d8\u91cf\u548c\u4f7f\u7528let\u5b9a\u4e49\u7684\u5faa\u73af\u53d8\u91cf\u3002\u6267\u884c\u539f\u7406\u548c\u6267\u884c\u6548\u679c\u4e0d\u540c\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">\u4e09\u3001const<\/h2>\n\n\n\n<p>var\u5b9a\u4e49\u7684\u53d8\u91cf\uff0c\u53ef\u4ee5\u9884\u89e3\u6790\u63d0\u524d\u8c03\u7528\u7684\u7ed3\u679c\u662fundefined\uff0cconst\u5b9a\u4e49\u7684\u53d8\u91cf\u4e0d\u80fd\u9884\u89e3\u6790\uff0c\u63d0\u524d\u8c03\u7528\u7684\u7ed3\u679c\u662f \u62a5\u9519\u3002<br>var\u5b9a\u4e49\u7684\u53d8\u91cf\uff0c\u53d8\u91cf\u540d\u79f0\u53ef\u4ee5\u91cd\u590d\uff0c\u6548\u679c\u662f\u91cd\u590d\u8d4b\u503c\uff0cconst\u5b9a\u4e49\u7684\u53d8\u91cf\u4e0d\u80fd\u91cd\u590d\uff0c\u5426\u5219\u6267\u884c\u62a5\u9519\u3002<br>var\u5b9a\u4e49\u7684\u53d8\u91cf\u4f5c\u7528\u57df\u662f\u5168\u5c40\/\u5c40\u90e8\u4f5c\u7528\u57df\u3002const\u5b9a\u4e49\u7684\u53d8\u91cf\u5982\u679c\u5728{}\u4e2d\u53ea\u80fd\u5728{}\u4e2d\u8c03\u7528\u3002<br>const \u5b9a\u4e49\u7684\u53d8\u91cf\u5b58\u50a8\u7684\u6570\u636e\u6570\u503c\u4e0d\u80fd\u6539\u53d8\uff0c\u4e5f\u5c31\u662fconst\u5b9a\u4e49\u7684\u53d8\u91cf\uff0c\u4e0d\u80fd\u91cd\u590d\u8d4b\u503c\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">\u4ee3\u7801\u6f14\u793a<\/h2>\n\n\n\n<p>\uff081\uff09\u63d0\u524d\u8c03\u7528\u62a5\u9519<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>    \/\/ \u63d0\u524d\u8c03\u7528 \u9884\u89e3\u6790\n    console.log( int1 );\n    \/\/ \/\/ \u63d0\u524d\u8c03\u7528 \u7ed3\u679c\u662f\u62a5\u9519\n    console.log( int2 );\n\n\n    \/\/ var \u5b9a\u4e49\u7684\u53d8\u91cf \n    var int1 = 100 ;\n    let int2 = 200 ;<\/code><\/pre>\n\n\n\n<p>\uff082\uff09const\u4e0e let \u5b9a\u4e49\u7684\u53d8\u91cf\u4e0d\u80fd\u91cd\u590d<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>    \/\/ var \u5b9a\u4e49\u7684\u53d8\u91cf \n    var int1 = 100 ;\n    let int2 = 200 ;\n\n    \/\/ \u53d8\u91cf\u540d\u79f0\u91cd\u590d \u91cd\u590d\u8d4b\u503c\u6548\u679c\n    var int1 = '\u5317\u4eac' ;\n    console.log( int1 );\n\n    \/\/ \u53d8\u91cf\u540d\u79f0\u91cd\u590d \u7ed3\u679c\u662f\u62a5\u9519\n    let int2 = '\u4e0a\u6d77' ;<\/code><\/pre>\n\n\n\n<p>\uff083\uff09const\u4e0e let\u5b9a\u4e49\u7684\u53d8\u91cf\u5982\u679c\u5728{}\u4e2d\u53ea\u80fd\u5728{}\u4e2d\u8c03\u7528<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>    \/\/ \u5728 {} \u4e2d \u4f7f\u7528 let \u5b9a\u4e49\u53d8\u91cf \u53ea\u80fd\u5728 { } \u4e2d \u4f7f\u7528\n    \/\/ \u5982\u679c\u9700\u8981\u5728 { } \u4e2d \u5bf9 let \u5b9a\u4e49\u7684\u53d8\u91cf \u8fdb\u884c\u64cd\u4f5c \n    \/\/ \u63d0\u524d\u5b9a\u4e49 \u53d8\u91cf \u5728 {} \u4e2d \u8fdb\u884c\u8d4b\u503c\u64cd\u4f5c\n    if( true ){\n        var a = 300 ;\n        let b = 400 ;\n        \/\/ let \u58f0\u660e\u7684\u53d8\u91cf \u5728 { } \u4e2d\u53ef\u4ee5\u8c03\u7528\n        \/\/ \u5bf9 {} \u5916\u5b9a\u4e49\u7684\u53d8\u91cf \u8fdb\u884c\u8d4b\u503c\u64cd\u4f5c\n        console.log( b );\n    }\n\n    console.log( a ) ; \n\n    \/\/ let \u58f0\u660e\u7684\u53d8\u91cf \u5728 { } \u5916 \u4e0d\u80fd\u8c03\u7528 \n    console.log( b );<\/code><\/pre>\n\n\n\n<p>\uff084\uff09const\u5b9a\u4e49\u7684\u53d8\u91cf\u4e0d\u80fd\u91cd\u590d\u8d4b\u503c\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>    \/\/ const \u5b9a\u4e49\u7684\u53d8\u91cf \u4e0d\u80fd\u91cd\u590d\u8d4b\u503c\n\n    \/\/ const c = 100 ;\n    \/\/ c = 200 ;\n    \/\/ \u7ed3\u679c\u662f\u62a5\u9519\n\n    const arr = &#91;1,2,3,4,5] ;\n    \/\/ \u53ea\u662f\u4fee\u6539\u5f15\u7528\u6570\u636e\u7c7b\u578b\u4e2d,\u6570\u636e\u5355\u5143\u5b58\u50a8\u7684\u6570\u636e\n    \/\/ \u6ca1\u6709\u4fee\u6539 arr\u53d8\u91cf\u4e2d \u5b58\u50a8\u7684\u5f15\u7528\u6570\u636e\u7c7b\u578b\u7684\u5185\u5b58\u5730\u5740\n    arr&#91;0] = '\u5317\u4eac' ;\n    console.log( arr );<\/code><\/pre>\n\n\n\n<p>\u8fd0\u884c\u7ed3\u679c\uff1a<\/p>\n\n\n\n<p>\uff081\uff09\u63d0\u524d\u8c03\u7528\u62a5\u9519<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><div class='fancybox-wrapper lazyload-container-unload' data-fancybox='post-images' href='https:\/\/qaqaq.top\/wp-content\/uploads\/2022\/12\/image-273.png'><img class=\"lazyload lazyload-style-1\" src=\"data:image\/svg+xml;base64,PCEtLUFyZ29uTG9hZGluZy0tPgo8c3ZnIHdpZHRoPSIxIiBoZWlnaHQ9IjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgc3Ryb2tlPSIjZmZmZmZmMDAiPjxnPjwvZz4KPC9zdmc+\"  loading=\"lazy\" decoding=\"async\" width=\"654\" height=\"155\" data-original=\"https:\/\/qaqaq.top\/wp-content\/uploads\/2022\/12\/image-273.png\" src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB\/AAffA0nNPuCLAAAAAElFTkSuQmCC\" alt=\"\" class=\"wp-image-2607\"  sizes=\"(max-width: 654px) 100vw, 654px\" \/><\/div><\/figure>\n\n\n\n<p>\uff082\uff09const\u4e0e let \u5b9a\u4e49\u7684\u53d8\u91cf\u4e0d\u80fd\u91cd\u590d<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><div class='fancybox-wrapper lazyload-container-unload' data-fancybox='post-images' href='https:\/\/qaqaq.top\/wp-content\/uploads\/2022\/12\/image-274.png'><img class=\"lazyload lazyload-style-1\" src=\"data:image\/svg+xml;base64,PCEtLUFyZ29uTG9hZGluZy0tPgo8c3ZnIHdpZHRoPSIxIiBoZWlnaHQ9IjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgc3Ryb2tlPSIjZmZmZmZmMDAiPjxnPjwvZz4KPC9zdmc+\"  loading=\"lazy\" decoding=\"async\" width=\"607\" height=\"138\" data-original=\"https:\/\/qaqaq.top\/wp-content\/uploads\/2022\/12\/image-274.png\" src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB\/AAffA0nNPuCLAAAAAElFTkSuQmCC\" alt=\"\" class=\"wp-image-2608\"  sizes=\"(max-width: 607px) 100vw, 607px\" \/><\/div><\/figure>\n\n\n\n<p>\uff083\uff09const\u4e0e let\u5b9a\u4e49\u7684\u53d8\u91cf\u5982\u679c\u5728{}\u4e2d\u53ea\u80fd\u5728{}\u4e2d\u8c03\u7528<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><div class='fancybox-wrapper lazyload-container-unload' data-fancybox='post-images' href='https:\/\/qaqaq.top\/wp-content\/uploads\/2022\/12\/image-275.png'><img class=\"lazyload lazyload-style-1\" src=\"data:image\/svg+xml;base64,PCEtLUFyZ29uTG9hZGluZy0tPgo8c3ZnIHdpZHRoPSIxIiBoZWlnaHQ9IjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgc3Ryb2tlPSIjZmZmZmZmMDAiPjxnPjwvZz4KPC9zdmc+\"  loading=\"lazy\" decoding=\"async\" width=\"784\" height=\"325\" data-original=\"https:\/\/qaqaq.top\/wp-content\/uploads\/2022\/12\/image-275.png\" src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB\/AAffA0nNPuCLAAAAAElFTkSuQmCC\" alt=\"\" class=\"wp-image-2609\"  sizes=\"(max-width: 784px) 100vw, 784px\" \/><\/div><\/figure>\n\n\n\n<p>\uff084\uff09const\u5b9a\u4e49\u7684\u53d8\u91cf\u4e0d\u80fd\u91cd\u590d\u8d4b\u503c\u3002<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><div class='fancybox-wrapper lazyload-container-unload' data-fancybox='post-images' href='https:\/\/qaqaq.top\/wp-content\/uploads\/2022\/12\/image-276.png'><img class=\"lazyload lazyload-style-1\" src=\"data:image\/svg+xml;base64,PCEtLUFyZ29uTG9hZGluZy0tPgo8c3ZnIHdpZHRoPSIxIiBoZWlnaHQ9IjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgc3Ryb2tlPSIjZmZmZmZmMDAiPjxnPjwvZz4KPC9zdmc+\"  loading=\"lazy\" decoding=\"async\" width=\"558\" height=\"209\" data-original=\"https:\/\/qaqaq.top\/wp-content\/uploads\/2022\/12\/image-276.png\" src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB\/AAffA0nNPuCLAAAAAElFTkSuQmCC\" alt=\"\" class=\"wp-image-2610\"  sizes=\"(max-width: 558px) 100vw, 558px\" \/><\/div><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\">\u56db\u3001\u5faa\u73af\u4e2dlet\u548cvar\u58f0\u660e\u7684\u5faa\u73af\u53d8\u91cf\u7684\u533a\u522b<\/h2>\n\n\n\n<p>4.1 \u4e8b\u4ef6\u7684\u7ed1\u5b9a<br>\u901a\u8fc7for\u5faa\u73af\u7ed9\u6807\u7b7e\u7ed1\u5b9a\u4e8b\u4ef6\uff0c\u4e5f\u5c31\u662f\u4e00\u6253\u5f00\u6267\u884c\u754c\u9762\uff0c\u4e8b\u4ef6\u7ed1\u5b9a\u5c31\u7ed3\u675f\u4e86\uff0c\u4e5f\u5c31\u662f \u5faa\u73af\u5df2\u7ecf\u7ed3\u675f\u4e86\uff0c\u4e5f\u5c31\u662f\u89e6\u53d1\u4e8b\u4ef6\u65f6\u5faa\u73af\u5df2\u7ecf\u7ed3\u675f\u4e86\u3002<\/p>\n\n\n\n<p>4.2 \u5faa\u73af\u53d8\u91cf\u5b58\u50a8\u7684\u6570\u636e\u6570\u503c<\/p>\n\n\n\n<p>4.2.1 var\u58f0\u660e\u7684\u5faa\u73af\u53d8\u91cf<br>\u5728\u6574\u4e2a\u5faa\u73af\u53d8\u91cf\u8fc7\u7a0b\u4e2d\u53ea\u5b9a\u4e49\u4e86\u4e00\u4e2a\u5faa\u73af\u53d8\u91cfi\uff0c\u6bcf\u6b21\u5faa\u73af\u90fd\u5bf9\u8fd9\u4e00\u4e2a\u5faa\u73af\u53d8\u91cfi\u8fdb\u884c\u91cd\u590d\u8d4b\u503c\uff0c\u4e5f\u5c31\u662f\u4e4b\u540e\u7684\u5faa\u73af\u53d8\u91cf\u6570\u503c\u4f1a\u8986\u76d6\u4e4b\u524d\u7684\u5faa\u73af\u53d8\u91cf\u6570\u503c\uff0c\u5f53\u5faa\u73af\u7ed3\u675f\u540e\u53ea\u6709\u4e00\u4e2a\u5faa\u73af\u53d8\u91cfi\uff0c\u5b58\u50a8\u7684\u662f\u6700\u7ec8\u7684\u5faa\u73af\u53d8\u91cf\u6570\u503c\u3002<\/p>\n\n\n\n<p>4.2.2 let\u58f0\u660e\u7684\u5faa\u73af\u53d8\u91cf<br>\u5728\u6574\u4e2a\u5faa\u73af\u8fc7\u7a0b\u4e2d\u6bcf\u6b21\u5faa\u73af\u90fd\u76f8\u5f53\u4e8e\u89e6\u53d1\u6267\u884c\u4e86\u4e00\u4e2a{ }\uff0c\u6bcf\u4e00\u4e2a{ }\u5bf9\u4e8elet\u5b9a\u4e49\u7684\u53d8\u91cf\u5c31\u662f\u4e00\u4e2a\u72ec\u7acb\u7684\u4f5c\u7528\u57df\uff0c\u4e5f\u5c31\u662f\u6bcf\u6b21\u5faa\u73aflet\u58f0\u660e\u7684\u5faa\u73af\u53d8\u91cf\u90fd\u662f\u4e00\u4e2a\u4eba\u72ec\u7acb\u4f5c\u7528\u57df\u4e2d\u7684\u5faa\u73af\u53d8\u91cf\uff0c\u6bcf\u4e00\u6b21\u5faa\u73af\u4e2d\u5faa\u73af\u53d8\u91cf\u90fd\u4f1a\u5b58\u50a8\u4e0d\u540c\u7684\u6570\u636e\u6570\u503c\uff0c\u4e92\u76f8\u4e4b\u95f4\u4e0d\u4f1a\u5f71\u54cd\uff0c\u4e0d\u4f1a\u8986\u76d6\uff0c\u4e5f\u5c31\u662f\u6bcf\u6b21\u5faa\u73aflet\u58f0\u660e\u7684\u5faa\u73af\u53d8\u91cf\u90fd\u76f8\u5f53\u4e8e\u662f\u4e00\u4e2a\u72ec\u7acb\u7684\u53d8\u91cf\uff0c\u4e0d\u4f1a\u8986\u76d6\u4e4b\u524d\u7684\u6570\u636e\u6570\u503c\u3002<\/p>\n\n\n\n<p>\u4ee3\u7801\u6f14\u793a\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>&lt;ul>\n    &lt;li>\u6211\u662f\u7b2c\u4e00\u4e2ali&lt;li\/>\r\n    &lt;li>\u6211\u662f\u7b2c\u4e8c\u4e2ali&lt;li\/>\r\n    &lt;li>\u6211\u662f\u7b2c\u4e09\u4e2ali&lt;li\/>\r\n    &lt;li>\u6211\u662f\u7b2c\u56db\u4e2ali&lt;li\/>\r\n    &lt;li>\u6211\u662f\u7b2c\u4e94\u4e2ali&lt;li\/>\n&lt;\/ul>\n\n&lt;script>\n    \/\/ \u7ed9 li \u7ed1\u5b9a\u4e8b\u4ef6 \u70b9\u51fb li\u6807\u7b7e \u5f39\u51fa \u7d22\u5f15\u4e0b\u6807\n\n    \/\/ \u83b7\u53d6\u6807\u7b7e\u5bf9\u8c61\n    const oLis = document.querySelectorAll('ul>li');\n\n    \/\/ \u901a\u8fc7 for\u5faa\u73af \u7ed9 li\u6807\u7b7e \u7ed1\u5b9a\u4e8b\u4ef6\n    for( var i = 0 ; i &lt;= oLis.length -1 ; i++ ){\n        \/\/ i \u662f \u7d22\u5f15\u4e0b\u6807 oLis&#91;i] \u662f li\u6807\u7b7e\u5bf9\u8c61\n        oLis&#91;i].addEventListener( 'click' , function(){\n\n            \/\/ \u70b9\u51fb\u65f6\u8f93\u51fa\u7d22\u5f15\u4e0b\u6807\n            console.log( `\u6211\u662fvar\u5faa\u73af\u7684i ${i}` );\n        })\n    }\n    for( let j = 0 ; j &lt;= oLis.length -1 ; j++ ){\n        \/\/ i \u662f \u7d22\u5f15\u4e0b\u6807 oLis&#91;i] \u662f 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