tryjsref_number_placeholder2 在线代码实例

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<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>W3Cschool教程(w3cschool.cn)</title>
</head>
<body>
<input type="number" id="myNumber" placeholder="Favorite Number">
<p>点击按钮显示 number 字段的提示信息。</p>
<button onclick="myFunction()">点我</button>
<p id="demo"></p>
<script>
function myFunction() {
    var x = document.getElementById("myNumber").placeholder;
    document.getElementById("demo").innerHTML = x;
}
</script>
</body>
</html>
 
 
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运行结果
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