HTML5labels属性
其他
2018-05-12 20:20:45
阅读次数: 0
用法：obj.labels代表该元素所绑定的标签元素所构成的集合
<body>
<script>
function checkVal(){
var txtName=document.getElementById("txt_name");
var form=document.getElementById("testform");
var btn=document.getElementById("btn");
if(txtName.value.trim()=="") { //trim()意思为去掉两边空格
var label = document.createElement("label");
label.setAttribute("for","txt_name");
form.insertBefore(label, btn);
txtName.labels[1].innerHTML = "请输入你的姓名";
txtName.labels[1].setAttribute("style", "font-size:14px;color:red;");
}else if(txtName.labels.length>1){
form.removeChild(txtName.labels[1]);
}
}
</script>
<form id="testform">
<label id="label" for="txt_name">姓名：</label>
<input type="text" id="txt_name">
<input type="button" id="btn" value="验证" onclick="checkVal()">
</form>
</body>
转载自blog.csdn.net/insist_bin/article/details/78842279