jquery html5 实现placeholder 兼容password ie6

<style type="text/css">
/* 设置提示文字颜色 */
::-webkit-input-placeholder {
color: #838383;
}
:-moz-placeholder {
color: #838383;
}
.placeholder {
color: #ccc;
}
</style>
登录用户名、密码文字提示，鼠标离开显示文字 html5 and jquery
账号：<input type="text" name="email" placeholder = '用户账号' />
密码：<input type="password" name="password" placeholder = '密码' autocomplete="off" />
<script type="text/javascript">
//判断浏览器是否支持 placeholder属性
function isPlaceholder(){
	var input = document.createElement('input');
	return 'placeholder' in input;
}

if (!isPlaceholder()) {//不支持placeholder 用jquery来完成
	$(document).ready(function() {
	    if(!isPlaceholder()){
	        $("input").not("input[type='password']").each(//把input绑定事件 排除password框
	            function(){
	                if($(this).val()=="" && $(this).attr("placeholder")!=""){
	                    $(this).val($(this).attr("placeholder"));
	                    $(this).focus(function(){
	                        if($(this).val()==$(this).attr("placeholder")) $(this).val("");
	                    });
	                    $(this).blur(function(){
	                        if($(this).val()=="") $(this).val($(this).attr("placeholder"));
	                    });
	                }
	        });
	        //对password框的特殊处理1.创建一个text框 2获取焦点和失去焦点的时候切换
	        var pwdField	= $("input[type=password]");
	        var pwdVal		= pwdField.attr('placeholder');
	        pwdField.after('<input id="pwdPlaceholder" type="text" value='+pwdVal+' autocomplete="off" />');
	        var pwdPlaceholder = $('#pwdPlaceholder');
	        pwdPlaceholder.show();
	        pwdField.hide();
	        
	        pwdPlaceholder.focus(function(){
	        	pwdPlaceholder.hide();
	        	pwdField.show();
	        	pwdField.focus();
	        });
	        
	        pwdField.blur(function(){
	        	if(pwdField.val() == '') {
	        		pwdPlaceholder.show();
	        		pwdField.hide();
	        	}
	        });
	        
	    }
	});

}
</script>