<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<style>
.search{
width: 350px;
height: 30px;
margin: 100px auto;
position: relative;
}
.search input{
width: 200px;
height: 25px;
}
.search label{
font-size: 12px;
color: #CCCCCC;
position: absolute;
top: 8px;
left: 20px;
cursor: text;
}
</style>
<script>
window.onload=function(){
function $(id){
return document.getElementById(id);
}
$("txt").focus();/*自动获取焦点*/
$("txt").oninput = function(){
if(this.value == ""){
$("message").style.display="block";
}
else{
$("message").style.display="none";
}
};
}
</script>
</head>
<body>
<div class="search">
<input type="text" id="txt" />
<label for="txt" id="message">淘宝淘宝</label>
</div>
</body>
</html>js 用户输入
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转载自blog.csdn.net/weixin_44119660/article/details/86669210
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