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<!DOCTYPE html> <html> <body> <p>单击该按钮以警告已删除空格的字符串。</p> <button onclick="myFunction()">试一试</button> <p><strong>注意：</strong> Internet Explorer 8 及更早版本不支持 trim() 方法。</p> <script> function myFunction() { var str = " Hello World! "; alert(str.trim()); } </script> </body> </html>