瀑布流~

window.onscroll = function(){
var windowH = document.documentElement.clientHeight;
var scrollH = document.documentElement.scrollTop || document.body.scrollTop;
var documentH = document.documentElement.scrollHeight || document.body.scrollHeight;

if(windowH+scrollH>documentH-20){
     createDiv()
}

}
// 自适应
window.onresize = function(){
change()
}
// 找数组中最小元素的下标
function minIndex(arr){
var m=0;
for (var i = 0; i < arr.length; i++) {
m = Math.min(arr[m],arr[i])==arr[m]?m : i
};
return m
}