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<!DOCTYPE html>
<html>
<body>
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<h1>JavaScript 字符串</h1>
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<h2>trim() 方法</h2>
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<p>trim() 删除字符串两边的空格：</p>
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<pre><p id="demo1"></p></pre>
<pre><p id="demo2"></p></pre>
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<script>
let text = "     Hello World!     ";
let result = text.trim();
​
document.getElementById("demo1").innerHTML = text;
document.getElementById("demo2").innerHTML = result;
</script>
​
</body>
</html>
​