<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>demo</title>
<style>
input {
color: #999;
}
</style>
</head>
<body>
<input type="text" value="手机">
<script>
// 1.获取元素
var de = document.querySelector("input");
// 2.聚焦的操作
de.onfocus = function(){
if(de.value==='手机'){
de.value='';
}
de.style.color="#333";
}
// 3.失焦的操作
de.onblur = function(){
if(de.value===''){
de.value='手机';
}
de.style.color='#999'
}
</script>
</body>
</html>JS「entrada」demostración
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Origin blog.csdn.net/weixin_60789461/article/details/123610272
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