效果描述：输入状态和为输入状态切换
原始输入框.png
输入中.png
源代码
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Document</title>
<style>
.gray {
color: gray;
}
.black {
color: black;
}
</style>
</head>
<body>
<input type="text" class="gray" value="请输入搜索关键字" id="txtSearch"> <input type="button" value="搜索" id="btnSearch">
<script>
var txtSearch = document.getElementById('txtSearch');
txtSearch.onfocus = function () {
if (this.value === '请输入搜索关键字') {
this.value = '';
this.className = 'black';
}
}
txtSearch.onblur = function () {
if (this.value.length === 0 || this.value === '请输入搜索关键字') {
this.value = '请输入搜索关键字';
this.className = 'gray';
}
}
</script>
</body>
</html>
网友评论