<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Title
</title>
<style>
.g{
color: lightgray;
}
.b{
color: #000;
}
</style>
</head>
<body>
<input type="text" placeholder="请输入内容"/>
<!--不是每个浏览器都支持这个-->
<p>当鼠标进入时，移除内容 /n
当鼠标退出时，添加内容</p>
<input type="text" class="g" value="请输入内容" onfocus="Focus(this);" onblur="Blur(this)" />
<script>
function Focus(arg){
arg.className="b"
var current_val= arg.value;
console.log(current_val)
if(current_val=='请输入内容'){
arg.value="";
}
}
function Blur(arg) {
var current_val= arg.value;
if(current_val=='请输入内容'||current_val.trim().length==0){
arg.value='请输入内容'
arg.className='g'
}
}
</script>
</body>
</html>
转载于:https://www.cnblogs.com/ezway/p/7028179.html
