<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Document</title>
</head>
<body>
<label for="">用户名：</label><input type="text" id="ipt">
<script type="text/javascript">
var ipt=document.getElementById('ipt');
ipt.value="请输入用户名";
ipt.style.color='gray';
ipt.onclick=function(){
if (this.value=="请输入用户名") {
this.selectionStart=0;
this.selectionEnd=0;
}
}
ipt.onkeydown=function(){
if (this.value=="请输入用户名") {
this.value="";
this.style.color='#000';
}
};
ipt.onkeyup=function(){
if (this.value.length==0) {
this.value="请输入用户名";
this.style.color='gray';
this.selectionStart=0;
this.selectionEnd=0;
}
}
</script>
</html>
实现H5中的placeholder功能
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转载自blog.csdn.net/weixin_44606660/article/details/87779573
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