<style>.box{position:absolute;width:100%;left:50%;height:auto;z-index:100;background-color:#f5f5f5;border:1px #ddd solid;padding:1px;}</style><div id="bg" v-click="closeMask()"></div>
<div class="box" style="display:none">
<input v-click="closeMask()" class="inpt_bottomb white" value="取 消" type="button" />
<div class="clear"></div>
</div> 
</div>

//弹出遮罩
$("#bg").css({
display: "block", height: $(document).height()
});
var $box = $('.box');
$box.css({
//设置弹出层距离左边的位置
left: ($("body").width() - $box.width()) / 2 -5 + "px",
//设置弹出层距离上面的位置
top: ($(window).height() - $box.height()) + $(window).scrollTop() + "px",
display: "block"
});

$('.box,#bg').bind("touchmove",function(e){
e.preventDefault();
});