HTML DOM Password maxLength 屬性
定義和用法
maxLength 屬性可設置或返回密碼域中所允許的最大字符數。
語法
設置maxLength 屬性:
passwordObject.maxLength=integer
返回maxLength 屬性:
passwordObject.maxLength
瀏覽器支持
所有主要瀏覽器都支持maxLength 屬性
實例
實例
下面的例子可顯示指定的密碼域中所允許的最大字符數:
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>本教程(w3big.com)</title>
<script>
function displayResult(){
var x=document.getElementById("pwd").maxLength;
alert(x);
}
</script>
</head>
<body>
<form>
密碼: <input type="password" id="pwd" maxlength="8">
</form>
<button type="button" onclick="displayResult()">顯示允許輸入的最多字符數</button>
</body>
</html>
<html>
<head>
<meta charset="utf-8">
<title>本教程(w3big.com)</title>
<script>
function displayResult(){
var x=document.getElementById("pwd").maxLength;
alert(x);
}
</script>
</head>
<body>
<form>
密碼: <input type="password" id="pwd" maxlength="8">
</form>
<button type="button" onclick="displayResult()">顯示允許輸入的最多字符數</button>
</body>
</html>
嘗試一下»
Password對象