JS实现瀑布流布局(2)

*{
  padding:0px;
  margin:0px;
}
.main{
  position:relative;
}
.box{
  padding:15px 0 0 10px;
  float:left;
}
.pic{
  padding:10px;
  border: 1px solid #ccc;
  border-radius: 5px;
  box-shadow: 0 0 5px #ccc;
  /*float:left;*/
}
img{
  width:170px;
  height:auto;
}

window.onload=function(){
  waterfall('main','box');
  var dataInt={"data":[{"src":"0.jpg"},{"src":"1.jpg"},{"src":"2.jpg"},{"src":"3.jpg"},{"src":"4.jpg"}]}
  window.onscroll=function(){
    if(checkScrollSlide){
      for(var i=0;i<dataInt.data.length;i++){
        var oparent=document.getElementById("main");
        var box=document.createElement("div");
        box.className="box";
        oparent.appendChild(box);
        var pic=document.createElement("div");
        pic.className="pic";
        box.appendChild(pic);
        var img=document.createElement("img");
        img.src="wallpoll/"+dataInt.data[i].src;
        pic.appendChild(img);
      }
    }
    waterfall('main','box');
  }
}
function waterfall(parent,child){
  var oparent=document.getElementById(parent);
  var boxs=oparent.getElementsByClassName(child);
  var boxw=boxs[0].offsetWidth;
  var cols=Math.floor(document.documentElement.clientWidth/boxw);
  oparent.style.cssText="width:"+cols*boxw+"px;margin:0 auto";
  var harr=new Array();
  for(var i=0;i<boxs.length;i++){
    if(i<cols){
      harr.push(boxs[i].offsetHeight);
     }else{
      var minH=Math.min.apply(null,harr);
      var index=getMinhIndex(harr,minH);
      boxs[i].style.position="absolute";
      boxs[i].style.top=minH+"px";
      boxs[i].style.left=boxs[index].offsetLeft+"px";
      harr[index]+=boxs[i].offsetHeight;
    }
  }
}
function getMinhIndex(arr,val){
  for(var i in arr){
    if(arr[i]===val){
      return i;
    }
  }
}
function checkScrollSlide(){
  var oparent=document.getElementById("main");
  var boxs=oparent.getElementsByClassName("box");
  var lastBox=boxs[boxs.length-1];
  var height=lastBox.offsetTop+Math.floor(lastBox.offsetHeight/2);
  var scrollHeigth=document.documentElement.scrollTop || document.body.scrollTop;
  // console.log(scrollHeigth);
  var seeHeigth=document.documentElement.clientHeigth || document.body.clientHeigth;
  return seeHeigth+scrollHeigth>height?true:false;
}