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              <h2>本示例只能在IE中查看</h2>
<p>(叠加与否完全取决于两个box是否是位于同一BFC的两个相邻box,与水平垂直无关)摘自winter的blog文章:http://www.cnblogs.com/winter-cn/archive/2012/11/16/2772562.html</p>
<div class="m-demo">
  <div class="item">1</div>
  <div class="item">2</div>
</div> 

            
          
!
            
              @import "compass/css3";

html,body{
  margin:0;
  padding: 0;
  width: 100%;
  height: 100%;
}

.m-demo{
  overflow: auto;
  width: 100%;
  height: 100%;
  writing-mode:tb-rl;
  >.item{
    width: 200px;
    height: 200px;
    line-height: 1;
    font-size: 68px;
    &:nth-child(1){
      margin: 30px;
    }
    &:nth-child(2){
      margin: 50px;
    }
  }
}


            
          
!
            
              function getRandomColors(json) {

    var AdditionArr = [productAddition()];

    function productColor(json) {

        for (var key in json) {

            var ele = json[key];

            for (var i = 0; i < ele.length; i++) {

                function isNowAdditionArr() {
                    var NowproductAddition = productAddition();

                    var NowAdditionArr = AdditionArr.every(function (item, index, array) {
                        return item != NowproductAddition;
                    });

                    if (NowAdditionArr) {
                        AdditionArr.push(NowproductAddition);
                    } else {
                        isNowAdditionArr();
                    }
                }

                isNowAdditionArr();

                ele[i].style.backgroundColor = "rgb(" + AdditionArr[AdditionArr.length - 1].toString() + ")";

            }

        }

    }

    function productAddition() {
        var Addition = [];

        for (var j = 0; j < 2000; j++) {
            if (Addition.length == 3) {
                break;
            }
            var rdm1 = Math.random().toFixed(1) * 10;
            var rdm2 = Math.random().toFixed(1) * 10;
            var rdm3 = Math.random().toFixed(1) * 10;
            var Addit = Number(rdm1.toString() + rdm2.toString() + rdm3.toString());
            if (Addit > 0 && Addit < 255) {
                Addition.push(Addit);
            } else {
                continue;
            }
        }

        return Addition;
    }

    productColor(json);

}

getRandomColors({
    a: (function () {
        var arr = [];
        for (var i = 0, eles = document.getElementsByTagName("body")[0].getElementsByTagName("*"); i < eles.length; i++) {
            if(eles[i].getAttribute("data-hasbgclr")){
                continue;
            }
            arr.push(eles[i]);
        }
        return arr.slice(0, arr.length - 1);
    })()
});
/*生成随机颜色函数2,保证不会生成两个相同的颜色,有时不希望某个元素生成随机颜色,只需要给对应元素添加自定义属性data-hasbgclr="false"即可*/
            
          
!
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