css3多重背景

多重背景写在最前边的 层级是在最上边

		div{
            width: 100px;
            height: 100px;
            background: url("./img/pdx.jpg") 0 0 no-repeat, url(./img/logo.png) 0 0 no-repeat;
            /* background: url(./img/logo.png) 0 0 no-repeat, url("./img/pdx.jpg") 0 0 no-repeat; */
            background-size: 100% 100%;
      	  }

		div{
            width: 100px;
            height: 100px;
            /* background: url("./img/pdx.jpg") 0 0 no-repeat, url(./img/logo.png) 0 0 no-repeat; */
            background: url(./img/logo.png) 0 0 no-repeat, url("./img/pdx.jpg") 0 0 no-repeat;
            background-size: 100% 100%;
      	  }