<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>placeholder效果</title>
<script type="text/javascript" src="http://apps.bdimg.com/libs/jquery/2.1.4/jquery.js"></script>
</head>
<body>
<form name="testForm" action="" method="">
<input type="text" name="hotGoods" class="text1">
</form>
<script type="text/javascript">
$(document).ready(function() {
$("input.text1").val(‘请输入您要搜索的内容‘).css(‘color‘,‘#ccc‘);
textFill($(‘input.text1‘));
});
function textFill(input){
var originalvalue = input.val(); //请输入您要搜索的内容
// console.log(originalvalue);
input.focus( function(){
if( $.trim(input.val()) == originalvalue ){
input.css(‘color‘, ‘#333‘);
input.val(‘‘);
}
});
input.blur( function(){
if( $.trim(input.val()) == ‘‘ ){
input.css(‘color‘, ‘#ccc‘);
input.val(originalvalue);
}
});
}
</script>
</body>
</html>
原文：http://www.cnblogs.com/roves/p/4971949.html