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<h1>JavaScript String.trim()</h1>
<p>IE 8 不支持 String.trim()。您可搭配正则表达式使用 replace() 方法代替：</p>
<script>
var str = " Hello World! ";
alert(str.replace(/^[\s\uFEFF\xA0]+|[\s\uFEFF\xA0]+$/g, ''));
</script>
</body>
</html>