web前端|js教程
js,加载图片
web前端-js教程
本文实例为大家讲解了javascript瀑布流代码，即js页面滚动延迟加载图片，分享给大家供大家参考，具体代码如下
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var _CalF = { $:function(object){//选择器 if(object === undefined ) return; var getArr = function(name,tagName,attr){ var tagName = tagName || *, eles = document.getElementsByTagName(tagName), clas = (typeof document.body.style.maxHeight === "undefined") ? "className" : "class";//ie6 attr = attr || clas, Arr = []; for(var i=0;i<eles.length;i++){ if(eles[i].getAttribute(attr)==name){ Arr.push(eles[i]); } } return Arr; }; if(object.indexOf(#) === 0){ //#id return document.getElementById(object.substring(1)); } else if(object.indexOf(.) === 0){ //.class return getArr(object.substring(1)); } else if(object.match(/=/g)){ //attr=name return getArr(object.substring(object.search(/=/g)+1),null,object.substring(0,object.search(/=/g))); } else if(object.match(/./g)){ //tagName.className return getArr(object.split(.)[1],object.split(.)[0]); } }, getPosition : function(obj) { //获取元素在页面里的位置和宽高 var top = 0, left = 0, width = obj.offsetWidth, height = obj.offsetHeight; while(obj.offsetParent){ top += obj.offsetTop; left += obj.offsetLeft; obj = obj.offsetParent; } return {"top":top,"left":left,"width":width,"height":height}; } }; //添加图片list var _temp = []; for (var i = 1; i < 21; i ++) { _temp.push(
图片 + i); } _CalF.$("#content").innerHTML = _temp.join(""); function scrollLoad(){ this.init.apply(this, arguments); } scrollLoad.prototype ={ init : function(className){ var className = "img."+className, imgs = _CalF.$(className), that = this; this.imgs = imgs; that.loadImg(); window.onscroll = function(){ that.time = setTimeout(function(){ that.loadImg(); },400); } }, loadImg : function(){ var imgs = this.imgs.reverse(), //获取数组翻转 len = imgs.length; if(imgs.length===0){ clearTimeout(this.time); return; } for(var j=len-1;j>=0;j--){ //递减 var img = imgs[j], imgTop = _CalF.getPosition(img).top, imgSrc = img.getAttribute("data-src"), offsetPage = window.pageYOffset ? window.pageYOffset : window.document.documentElement.scrollTop,//滚动条的top值 bodyHeight = document.documentElement.clientHeight; //body的高度 if((offsetPage+bodyHeight/2) > (imgTop-bodyHeight/2)){ img.src = imgSrc; this.imgs.splice(j,1); } } } } var img1 = new scrollLoad("scrollLoading");
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