<!doctype html> <html> <head> <meta charset="utf-8"> <title>Placeholder兼容各大浏览器的例子</title> <script src="jquery-1.8.0.min.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> <!--以下就是代码也可以单独起个名字，使用link在头部引用--> <script> /* * 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(); }); </script>
亲测，IE各版本都支持
☆☆☆☆☆Placeholder兼容各大浏览器的例子☆☆☆☆☆
原文：http://www.cnblogs.com/heyiming/p/7007901.html