如果浏览器支持脚本，那么它不会显示出 noscript 元素中的文本。
无法识别 <script> 标签的浏览器会把标签的内容显示到页面上。为了避免浏览器这样做，您应当在注释标签中隐藏脚本。老式的（无法识别 &script> 标签的）浏览器会忽略注释，这样就不会把标签的内容写到页面上，而新式的浏览器则懂得执行这些脚本，即使它们被包围在注释标签中！ </script>
实例代码
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