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<!DOCTYPE html> <html> <body> <h1>JavaScript 字符串</h1> <h2>replace() 方法</h2> <p>删除字符串两边的空格：</p> <pre><p id="demo1"></p></pre> <pre><p id="demo2"></p></pre> <script> let text = " Hello World! "; let result = text.replace(/^\s+|\s+$/gm,''); document.getElementById("demo1").innerHTML = text; document.getElementById("demo2").innerHTML = result; </script> </body> </html>