{"id":168333,"date":"2024-05-08T16:21:51","date_gmt":"2024-05-08T08:21:51","guid":{"rendered":"https:\/\/docs.pingcode.com\/ask\/ask-ask\/168333.html"},"modified":"2024-05-08T16:21:55","modified_gmt":"2024-05-08T08:21:55","slug":"javascript-%e7%9b%b4%e6%8e%a5%e9%87%8f%e4%b8%8d%e5%b0%b1%e6%98%af%e5%af%b9%e8%b1%a1%e5%90%97","status":"publish","type":"post","link":"https:\/\/docs.pingcode.com\/ask\/ask-ask\/168333.html","title":{"rendered":"javascript \u76f4\u63a5\u91cf\u4e0d\u5c31\u662f\u5bf9\u8c61\u5417"},"content":{"rendered":"<p style=\"text-align:center\"><img decoding=\"async\" src=\"https:\/\/cdn-kb.worktile.com\/kb\/wp-content\/uploads\/2024\/04\/27034504\/5a6054fe-0aec-4d29-8ad4-3a58490502bf.webp\" alt=\"javascript \u76f4\u63a5\u91cf\u4e0d\u5c31\u662f\u5bf9\u8c61\u5417\" \/><\/p>\n<p><p><strong>JavaScript \u76f4\u63a5\u91cf\u4e0e\u5bf9\u8c61\u662f\u4e24\u4e2a\u4e0d\u540c\u7684\u6982\u5ff5<\/strong>\u3002\u76f4\u63a5\u91cf\uff08\u4e5f\u79f0\u4e3a\u5b57\u9762\u91cf\u6216\u5e38\u91cf\uff09\u662f\u5728\u4ee3\u7801\u4e2d\u76f4\u63a5\u8868\u793a\u6570\u636e\u7684\u65b9\u5f0f\uff0c\u8fd9\u5305\u62ec\u4e86\u5b57\u7b26\u4e32\uff08\u5982 <code>&#039;Hello&#039;<\/code>\uff09\u3001\u6570\u5b57\uff08\u5982 <code>123<\/code>\uff09\u3001\u5e03\u5c14\u503c\uff08\u5982 <code>true<\/code> \u548c <code>false<\/code>\uff09\u3001\u6570\u7ec4\uff08\u5982 <code>[1,2,3]<\/code>\uff09\u3001\u5bf9\u8c61\u76f4\u63a5\u91cf\uff08\u5982 <code>{name: &quot;Alice&quot;}<\/code>\uff09\u3001null \u548c undefined \u7b49\u3002\u5bf9\u8c61\u5219\u662f JavaScript \u7684\u4e00\u4e2a\u6570\u636e\u7c7b\u578b\uff0c\u5b83\u5141\u8bb8\u5b58\u50a8\u952e\u503c\u5bf9\u96c6\u5408\u3002\u5373\u4f7f\u5bf9\u8c61\u5b57\u9762\u91cf\u662f\u4e00\u79cd\u76f4\u63a5\u91cf\uff0c\u4f46\u5e76\u975e\u6240\u6709\u7684\u76f4\u63a5\u91cf\u90fd\u662f\u5bf9\u8c61\u3002\u5bf9\u8c61\u5b57\u9762\u91cf\u662f\u521b\u5efa\u4e00\u4e2a\u65b0\u5bf9\u8c61\u7684\u7b80\u5199\u65b9\u6cd5\uff0c\u5b83\u9075\u5faa <code>{key: value}<\/code> \u7684\u683c\u5f0f\u3002\u800c\u5176\u4ed6\u7c7b\u578b\u7684\u76f4\u63a5\u91cf\uff0c\u5982\u6570\u5b57\u6216\u5b57\u7b26\u4e32\uff0c\u4e0d\u662f\u5bf9\u8c61\uff0c\u4f46\u5728\u5fc5\u8981\u65f6\uff0cJavaScript \u53ef\u4ee5\u5c06\u5b83\u4eec\u5305\u88c5\u4e3a\u5bf9\u8c61\u3002<\/p>\n<\/p>\n<p><p>\u4f8b\u5982\uff0c\u5f53\u4f60\u8c03\u7528\u4e00\u4e2a\u6570\u5b57\u76f4\u63a5\u91cf\u7684\u65b9\u6cd5\u65f6\uff0cJavaScript \u4f1a\u4e34\u65f6\u5c06\u5176\u5305\u88c5\u4e3a Number \u5bf9\u8c61\uff0c\u4ece\u800c\u5141\u8bb8\u4f60\u8bbf\u95ee\u65b9\u6cd5\u548c\u5c5e\u6027\u3002\u7136\u800c\uff0c\u8fd9\u79cd\u5305\u88c5\u662f\u4e34\u65f6\u7684\uff0c\u5e76\u4e0d\u610f\u5473\u7740\u76f4\u63a5\u91cf\u672c\u8eab\u5c31\u662f\u5bf9\u8c61\u3002<\/p>\n<\/p>\n<p><h3>\u5f15\u8a00<\/h3>\n<\/p>\n<p><p>JavaScript\u4e2d\u6570\u636e\u7c7b\u578b\u7684\u7406\u89e3\u662f\u7f16\u5199\u9ad8\u8d28\u91cf\u4ee3\u7801\u7684\u57fa\u7840\uff0c\u5c24\u5176\u662f\u5728\u533a\u5206\u76f4\u63a5\u91cf\u548c\u5bf9\u8c61\u6982\u5ff5\u65f6\u3002\u901a\u8fc7\u63a2\u7d22\u76f4\u63a5\u91cf\u7684\u4e0d\u540c\u7c7b\u578b\uff0c\u4ee5\u53ca\u5b83\u4eec\u5982\u4f55\u5728\u4ee3\u7801\u4e2d\u4f7f\u7528\uff0c\u6211\u4eec\u80fd\u591f\u66f4\u52a0\u6df1\u5165\u5730\u7406\u89e3\u4ed6\u4eec\u4e0e\u5bf9\u8c61\u7684\u533a\u522b\uff0c\u589e\u5f3a\u5bf9JavaScript\u7684\u638c\u63e1\u3002<\/p>\n<\/p>\n<p><h3>I\u3001\u76f4\u63a5\u91cf\u548c\u5bf9\u8c61\u7684\u533a\u522b<\/h3>\n<\/p>\n<p><p>\u76f4\u63a5\u91cf\u662f\u6570\u636e\u7684\u76f4\u63a5\u8868\u793a\uff0c\u5b83\u4eec\u662f\u7a0b\u5e8f\u4e2d\u786c\u7f16\u7801\u7684\u503c\u3002\u800c\u5bf9\u8c61\u662f\u7531\u5bf9\u8c61\u5b57\u9762\u91cf\u6216\u6784\u9020\u51fd\u6570\u521b\u5efa\u7684\uff0c\u5177\u6709\u5c5e\u6027\u548c\u65b9\u6cd5\u7684\u5b9e\u4f8b\u3002\u4e0d\u540c\u7c7b\u578b\u7684\u76f4\u63a5\u91cf\u5728JavaScript\u4e2d\u7684\u8868\u73b0\u4e5f\u4e0d\u5c3d\u76f8\u540c\u3002<\/p>\n<\/p>\n<p><h4>\u5b57\u7b26\u4e32\u548c\u6570\u5b57\u76f4\u63a5\u91cf<\/h4>\n<\/p>\n<p><p>\u5b57\u7b26\u4e32\u548c\u6570\u5b57\u662f\u4e24\u79cd\u6700\u5e38\u89c1\u7684\u76f4\u63a5\u91cf\u7c7b\u578b\u3002\u5b83\u4eec\u5728\u4ee3\u7801\u4e2d\u76f4\u63a5\u51fa\u73b0\uff0c\u65e0\u9700\u4efb\u4f55\u88c5\u9970\u6216\u58f0\u660e\u5373\u53ef\u4f7f\u7528\u3002<\/p>\n<\/p>\n<ul>\n<li>\u5b57\u7b26\u4e32\u76f4\u63a5\u91cf\u901a\u8fc7\u5355\u5f15\u53f7\u3001\u53cc\u5f15\u53f7\u6216\u53cd\u5f15\u53f7\u8868\u793a\uff0c\u5982 <code>&#039;hello&#039;<\/code>\u3001<code>&quot;world&quot;<\/code> \u6216 <code>`hello world`<\/code>\u3002<\/li>\n<li>\u6570\u5b57\u76f4\u63a5\u91cf\u5219\u76f4\u63a5\u7531\u6570\u5b57\u7ec4\u6210\uff0c\u53ef\u4ee5\u662f\u6574\u6570\u6216\u6d6e\u70b9\u6570\uff0c\u5982 <code>42<\/code> \u6216 <code>3.14<\/code>\u3002<\/li>\n<\/ul>\n<p><p>\u8fd9\u4e9b\u76f4\u63a5\u91cf\u5728\u4f7f\u7528\u65f6\u975e\u5e38\u76f4\u89c2\uff0c\u4f46\u7531\u4e8e\u5b83\u4eec\u4e0d\u662f\u5bf9\u8c61\uff0c\u6240\u4ee5\u5b83\u4eec\u6ca1\u6709\u53ef\u4ee5\u88ab\u8c03\u7528\u7684\u65b9\u6cd5\u548c\u5c5e\u6027\u3002<strong>\u5c3d\u7ba1\u8fd9\u6837\uff0cJavaScript \u4f1a\u5728\u9700\u8981\u65f6\u4e34\u65f6\u5c06\u5b83\u4eec\u5305\u88c5\u6210\u4e34\u65f6\u5bf9\u8c61<\/strong>\uff0c\u4ee5\u4fbf\u80fd\u591f\u4f7f\u7528\u4e00\u4e9b\u5185\u7f6e\u7684\u65b9\u6cd5\u3002<\/p>\n<\/p>\n<p><h4>\u5e03\u5c14\u503c\u76f4\u63a5\u91cf<\/h4>\n<\/p>\n<p><p>\u5e03\u5c14\u503c\u76f4\u63a5\u91cf\u662f\u903b\u8f91\u5b9e\u4f53\uff0c\u53ea\u6709\u4e24\u4e2a\u503c\uff1a<code>true<\/code> \u548c <code>false<\/code>\u3002\u5e03\u5c14\u503c\u5e38\u7528\u4e8e\u63a7\u5236\u6d41\u7a0b\u7ed3\u6784\uff0c\u5982 <code>if-else<\/code> \u8bed\u53e5\uff0c\u4e14\u5728\u7f16\u5199\u4ee3\u7801\u65f6\u4e0d\u9700\u8981\u989d\u5916\u7684\u51fd\u6570\u6216\u6784\u9020\u5668\u6765\u521b\u5efa\u3002<\/p>\n<\/p>\n<p><h3>II\u3001\u5bf9\u8c61\u5b57\u9762\u91cf\u7684\u4f7f\u7528<\/h3>\n<\/p>\n<p><p>\u5c3d\u7ba1\u5bf9\u8c61\u5b57\u9762\u91cf\u672c\u8eab\u662f\u4e00\u79cd\u76f4\u63a5\u91cf\uff0c\u4f46\u662f\u5f53\u5b83\u4eec\u88ab\u5b9a\u4e49\u65f6\uff0c\u5b83\u4eec\u5c06\u88ab\u89e3\u91ca\u4e3a\u5bf9\u8c61\u3002<\/p>\n<\/p>\n<p><h4>\u521b\u5efa\u5bf9\u8c61\u5b57\u9762\u91cf<\/h4>\n<\/p>\n<p><p>\u5bf9\u8c61\u5b57\u9762\u91cf\u662f\u901a\u8fc7 <code>{}<\/code> \u7b26\u53f7\u521b\u5efa\u7684\uff0c\u793a\u4f8b\u5982\u4e0b\uff1a<\/p>\n<\/p>\n<p><pre><code class=\"language-javascript\">let person = {<\/p>\n<p>  name: &quot;Alice&quot;, <\/p>\n<p>  age: 25, <\/p>\n<p>  greet() {<\/p>\n<p>    return &quot;Hello, &quot; + this.name;<\/p>\n<p>  }<\/p>\n<p>};<\/p>\n<p><\/code><\/pre>\n<\/p>\n<p><p>\u5728\u8fd9\u4e2a\u5bf9\u8c61\u5b57\u9762\u91cf\u4e2d\uff0c<code>name<\/code> \u548c <code>age<\/code> \u662f\u5c5e\u6027\uff0c<code>greet<\/code> \u662f\u65b9\u6cd5\u3002\u8fd9\u53ef\u4ee5\u76f4\u89c2\u5730\u8868\u793a\u5bf9\u8c61\u7684\u7ed3\u6784\uff0c\u800c\u4e0d\u9700\u8981\u5148\u5b9a\u4e49\u6784\u9020\u51fd\u6570\u3002<\/p>\n<\/p>\n<p><h4>\u8bbf\u95ee\u548c\u4fee\u6539\u5bf9\u8c61\u5c5e\u6027<\/h4>\n<\/p>\n<p><p>\u4f7f\u7528\u5bf9\u8c61\u5b57\u9762\u91cf\u521b\u5efa\u5bf9\u8c61\u540e\uff0c\u6211\u4eec\u53ef\u4ee5\u901a\u8fc7\u70b9\uff08<code>.<\/code>\uff09\u6216\u8005\u65b9\u62ec\u53f7\uff08<code>[]<\/code>\uff09\u8bed\u6cd5\u6765\u8bbf\u95ee\u6216\u4fee\u6539\u5bf9\u8c61\u7684\u5c5e\u6027\u548c\u65b9\u6cd5\u3002<\/p>\n<\/p>\n<p><pre><code class=\"language-javascript\">console.log(person.name); \/\/ \u8f93\u51fa &quot;Alice&quot;<\/p>\n<p>person.age = 26;<\/p>\n<p>person[&#039;name&#039;] = &quot;Bob&quot;;<\/p>\n<p><\/code><\/pre>\n<\/p>\n<p><h3>III\u3001\u6570\u7ec4\u76f4\u63a5\u91cf<\/h3>\n<\/p>\n<p><p>\u6570\u7ec4\u76f4\u63a5\u91cf\u662f\u901a\u8fc7 <code>[\u5143\u7d20\u5217\u8868]<\/code> \u7684\u5f62\u5f0f\u5b9a\u4e49\u7684\uff0c\u63d0\u4f9b\u4e86\u4e00\u79cd\u5feb\u901f\u521b\u5efa\u6570\u7ec4\u7684\u65b9\u5f0f\uff0c\u53ef\u4ee5\u5305\u542b\u4e0d\u540c\u7c7b\u578b\u7684\u5143\u7d20\u3002<\/p>\n<\/p>\n<p><h4>\u5b9a\u4e49\u6570\u7ec4\u76f4\u63a5\u91cf<\/h4>\n<\/p>\n<p><p>\u6570\u7ec4\u76f4\u63a5\u91cf\u7684\u793a\u4f8b\u5982\u4e0b\uff1a<\/p>\n<\/p>\n<p><pre><code class=\"language-javascript\">let fruits = [&quot;apple&quot;, &quot;banana&quot;, &quot;cherry&quot;];<\/p>\n<p><\/code><\/pre>\n<\/p>\n<p><p>\u8fd9\u884c\u4ee3\u7801\u5b9a\u4e49\u4e86\u4e00\u4e2a\u5305\u542b\u4e09\u4e2a\u5b57\u7b26\u4e32\u5143\u7d20\u7684\u6570\u7ec4\u3002\u4f60\u53ef\u4ee5\u901a\u8fc7\u6307\u5b9a\u7d22\u5f15\u6765\u8bbf\u95ee\u6570\u7ec4\u4e2d\u7684\u5404\u4e2a\u5143\u7d20\u3002<\/p>\n<\/p>\n<p><h4>\u64cd\u4f5c\u6570\u7ec4\u5143\u7d20<\/h4>\n<\/p>\n<p><p>\u6570\u7ec4\u63d0\u4f9b\u4e86\u4e30\u5bcc\u7684\u65b9\u6cd5\u6765\u64cd\u7eb5\u6570\u7ec4\u7684\u5143\u7d20\uff0c\u5982 <code>push\u3001pop\u3001shift\u3001unshift \u548c splice<\/code> \u7b49\u3002<\/p>\n<\/p>\n<p><pre><code class=\"language-javascript\">fruits.push(&quot;durian&quot;);<\/p>\n<p>console.log(fruits[3]); \/\/ \u8f93\u51fa &quot;durian&quot;<\/p>\n<p><\/code><\/pre>\n<\/p>\n<p><h3>IV\u3001\u7279\u6b8a\u76f4\u63a5\u91cf<\/h3>\n<\/p>\n<p><p>null \u548c undefined \u4e5f\u8868\u793a\u76f4\u63a5\u91cf\uff0c\u5b83\u4eec\u5404\u81ea\u4ee3\u8868\u6ca1\u6709\u503c\u548c\u672a\u5b9a\u4e49\u503c\u7684\u6982\u5ff5\u3002<\/p>\n<\/p>\n<p><h4>\u7406\u89e3 null \u548c undefined<\/h4>\n<\/p>\n<ul>\n<li><code>null<\/code> \u662f\u4e00\u4e2a\u8868\u793a\u65e0\u503c\u7684\u7279\u6b8a\u76f4\u63a5\u91cf\uff0c\u5b83\u662f\u4e00\u4e2a\u6545\u610f\u7684\u7a7a\u503c\u3002<\/li>\n<li><code>undefined<\/code> \u8868\u793a\u53d8\u91cf\u5df2\u58f0\u660e\u4f46\u672a\u521d\u59cb\u5316\u3002<\/li>\n<\/ul>\n<p><h4>\u4f7f\u7528\u573a\u666f\u533a\u522b<\/h4>\n<\/p>\n<p><p>\u901a\u5e38\uff0c<code>null<\/code> \u7528\u4e8e\u6545\u610f\u8d4b\u4e88\u53d8\u91cf\u65e0\u503c\u7684\u573a\u666f\u3002\u800c <code>undefined<\/code> \u901a\u5e38\u662f\u7531\u7cfb\u7edf\u81ea\u52a8\u751f\u6210\uff0c\u5f53\u8bbf\u95ee\u672a\u5b9a\u4e49\u7684\u53d8\u91cf\u6216\u672a\u63d0\u4f9b\u51fd\u6570\u53c2\u6570\u65f6\u4f1a\u9047\u5230\u3002<\/p>\n<\/p>\n<p><h3>V\u3001\u5305\u88c5\u5bf9\u8c61<\/h3>\n<\/p>\n<p><p>\u5bf9\u4e8e\u975e\u5bf9\u8c61\u7c7b\u578b\u7684\u76f4\u63a5\u91cf\uff0cJavaScript \u63d0\u4f9b\u4e86\u5305\u88c5\u5bf9\u8c61\uff0c\u5982 <code>String\u3001Number \u548c Boolean<\/code>\uff0c\u4ee5\u4fbf\u4e8e\u6211\u4eec\u5728\u8fd9\u4e9b\u57fa\u672c\u76f4\u63a5\u91cf\u4e0a\u4f7f\u7528\u65b9\u6cd5\u3002<\/p>\n<\/p>\n<p><h4>\u57fa\u7840\u7c7b\u578b\u4e0e\u5305\u88c5\u5bf9\u8c61<\/h4>\n<\/p>\n<p><p>\u6bcf\u4e2a\u57fa\u7840\u6570\u636e\u7c7b\u578b\uff08\u9664\u4e86 null \u548c undefined\uff09\u90fd\u6709\u5bf9\u5e94\u7684\u5305\u88c5\u5bf9\u8c61\u3002\u8fd9\u4e9b\u5305\u88c5\u5bf9\u8c61\u770b\u8d77\u6765\u50cf\u662f\u76f4\u63a5\u91cf\u7684\u5bf9\u8c61\u7248\u672c\uff0c\u5b83\u4eec\u6709\u81ea\u5df1\u7684\u5c5e\u6027\u548c\u65b9\u6cd5\u3002<\/p>\n<\/p>\n<p><pre><code class=\"language-javascript\">let str = &quot;hello&quot;;<\/p>\n<p>console.log(str.toUpperCase()); \/\/ \u8f93\u51fa &quot;HELLO&quot;<\/p>\n<p><\/code><\/pre>\n<\/p>\n<p><p>\u5373\u4fbf <code>str<\/code> \u662f\u4e00\u4e2a\u5b57\u7b26\u4e32\u76f4\u63a5\u91cf\uff0cJavaScript \u8fd8\u662f\u8ba9\u6211\u4eec\u53ef\u4ee5\u5728\u5b83\u4e0a\u9762\u8c03\u7528 <code>String<\/code> \u5bf9\u8c61\u7684 <code>toUpperCase<\/code> \u65b9\u6cd5\u3002<\/p>\n<\/p>\n<p><h4>\u5305\u88c5\u5bf9\u8c61\u7684\u4e34\u65f6\u6027\u8d28<\/h4>\n<\/p>\n<p><p>\u5f53\u4f7f\u7528\u57fa\u672c\u76f4\u63a5\u91cf\u8c03\u7528\u5c5e\u6027\u6216\u65b9\u6cd5\u65f6\uff0cJavaScript 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