<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>control属性</title>
</head>
<body>
<script>
function setNum(){
var lable = document.getElementById("l1");
var textBox = lable.control;
textBox.value = "18888888888 ";
}
</script>
<form>
<label id="l1">
手机号：
<input id="txtNum" maxlength="11">
<small>请输入手机号</small>
</label>
<input type="button" value="设置默认值" onclick="setNum()">
</form>
<!--control属性访问该表单元素-->
<input type="text" placeholder="用户名">
<input type="text" placeholder="密码">
<!--文本框未输入时，提示输入。当处于编辑编辑状态，去掉模糊状态-->
</body>
</html>control属性和placeholder属性
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