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<!DOCTYPE html>
<html>
<body>
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<h1>JavaScript 字符串</h1>
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<h2>length 属性</h2>
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<p>length 属性返回字符串的长度。</p>
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<p>查找 "Hello World!" 的长度：</p>
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<p id="demo"></p>
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<script>
let text = "Hello World!";
let length = text.length;
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document.getElementById("demo").innerHTML = length;
</script>
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</body>
</html>
​