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JS 参考手册
Input Text maxLength 属性
tryjsref_text_maxlength
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<!DOCTYPE html> <html> <body> Name: <input type="text" id="myText" maxlength="30"> <p>Click the button to display the value of the maxlength attribute in the text field.</p> <button onclick="myFunction()">Try it</button> <p id="demo"></p> <script> function myFunction() { var x = document.getElementById("myText").maxLength; document.getElementById("demo").innerHTML = x; } </script> </body> </html>