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<!DOCTYPE html> <html> <body> <h2>JavaScript String.trim()</h2> <p>IE 8 不支持 String.trim()。 要修剪字符串，您可以使用 polyfill。</p> <script> if (!String.prototype.trim) { String.prototype.trim = function () { return this.replace(/^[\s\uFEFF\xA0]+|[\s\uFEFF\xA0]+$/g, ''); }; } var str = " Hello World! "; alert(str.trim()); </script> </body> </html>