# 图片懒加载

**Repository Path**: ChenL0ng/lazyLoad

## Basic Information

- **Project Name**: 图片懒加载
- **Description**: jQuery实现图片懒加载
- **Primary Language**: Unknown
- **License**: Not specified
- **Default Branch**: master
- **Homepage**: None
- **GVP Project**: No

## Statistics

- **Stars**: 2
- **Forks**: 0
- **Created**: 2018-04-19
- **Last Updated**: 2021-03-28

## Categories & Tags

**Categories**: Uncategorized

**Tags**: None

## README

# 图片懒加载
jQuery实现图片懒加载
- 首先data-src属性是真实图片链接，src属性是loading.gif
- 添加scroll事件，判断需要进行懒加载的图片是否出现在视口区域，出现则更换src属性，加载图片
- 加载完毕的图片，要将其从图片待加载数组中删除
### HTML结构
```
	<div><img src="loading.gif" data-src="l.jpg"></div>
	<div><img src="loading.gif" data-src="l.jpg"></div>
	<div><img src="loading.gif" data-src="l.jpg"></div>
	<div><img src="loading.gif" data-src="l.jpg"></div>
	<div><img src="loading.gif" data-src="l.jpg"></div>
	<div><img src="loading.gif" data-src="l.jpg"></div>
```
### js代码
```
	(function(){
		var $window = $(window);
		var lazyImgs = [];
		$("img[data-src]").each(function(index, el) {
		    lazyImgs.push($(el));
		});

		function scroll(){
		    var scrollTop = $window.scrollTop();
		    var wHeight = $window.height();
		    var index = [];
		    for(var i = 0,len = lazyImgs.length;i < len;i++){
			var height = lazyImgs[i].offset().top;
			if(height - scrollTop < wHeight){
	        	    lazyImgs[i].attr("src",lazyImgs[i].data("src"));
			    index.unshift(i);
			}
		    }
			
		    for(var j = 0,lens = index.length;j < lens;j++){
			lazyImgs.splice(index[j], 1);				
		    }

		}

		$window.scroll(function(event) {
		    scroll();
		});

		scroll();
	})();