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/* * jQuery placeholder, fix for IE6,7,8,9 * @author JENA * @since 20131115.1504 * @website ishere.cn */ var JPlaceHolder = { //检测 _check : function(){ return ‘placeholder‘ in document.createElement(‘input‘); }, //初始化 init : function(){ if(!this._check()){ this.fix(); } }, //修复 fix : function(){ jQuery(‘:input[placeholder]‘).each(function(index, element) { var self = $(this), txt = self.attr(‘placeholder‘); self.wrap($(‘<div></div>‘).css({position:‘relative‘, zoom:‘1‘, border:‘none‘, background:‘none‘, padding:‘none‘, margin:‘none‘})); var pos = self.position(), h = self.outerHeight(true), paddingleft = self.css(‘padding-left‘); var holder = $(‘<span></span>‘).text(txt).css({position:‘absolute‘, left:pos.left, top:pos.top, height:h, lienHeight:h, paddingLeft:paddingleft, color:‘#aaa‘}).appendTo(self.parent()); self.focusin(function(e) { holder.hide(); }).focusout(function(e) { if(!self.val()){ holder.show(); } }); holder.click(function(e) { holder.hide(); self.focus(); }); }); } }; //执行 jQuery(function(){ JPlaceHolder.init(); });
<!doctype html>
<html>
<head>
<meta charset="utf-8">
<title>jQuery JPlaceholder Demo</title>
<script src="jquery-1.8.3.min.js"></script>
<script src="jquery.JPlaceholder.js"></script>
</head>
<body>
<form>
<div>
<ul>
<li>
<input type="text" name="username" placeholder="用户名">
</li>
<li>
<input type="password" name="username" placeholder="密码">
</li>
<li>
<button type="button">登录</button>
</li>
</ul>
</div>
</form>
</body>
</html>
转自：http://www.oschina.net/code/snippet_206691_26471
IE中有错误问题，需要自己调整，
调整我试用了line-height ，vertical-align:top; 如果不会样式就需要找别人帮忙处理一下了。
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原文地址：http://www.cnblogs.com/laj12347/p/4422353.html
