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<!DOCTYPE html> <html> <head> <meta charset="utf-8"> <title>素材8网教程(study.sucai8.cn)</title> </head> <body> 姓名: <input type="text" id="myText" maxlength="30"> <p>点击按钮显示文本域 maxlength 属性的值。</p> <button onclick="myFunction()">点我</button> <p id="demo"></p> <script> function myFunction() { var x = document.getElementById("myText").maxLength; document.getElementById("demo").innerHTML = x; } </script> </body> </html>
运行结果