Javascript

js批量下载图片并压缩打包

本文主要是介绍js批量下载图片并压缩打包，对大家解决编程问题具有一定的参考价值，需要的程序猿们随着小编来一起学习吧！

来自链接: js批量下载图片并压缩打包.

<!DOCTYPE html>
<html>
	<head>
		<meta charset="utf-8" />
		<title></title>
		<style>
			img{
				width: 200px;
				height: 150px;
			}
		</style>
	</head>
	<body>

		<!-- 注意图片的路径和项目域名必须不能存在跨域情况
		例如:项目部署在 域名为 www.baidu.com/index.html
		那么图片路径应改为 www.baidu.com/img/2.png -->
		
		<img src="img/2.png" />
		<img src="img/3.png" />
		<img src="img/1.jpeg" />
		
		<br /><br />
		<button onclick="packageImages()">packageImages</button><span id="status"></span><br /><br />
		
		<script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
		<script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/jszip/3.1.5/jszip.min.js"></script>
		<script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/FileSaver.js/1.3.8/FileSaver.min.js"></script>
		<script type="text/javascript">
		function packageImages(){
			$('#status').text('处理中。。。。。');
			
			var imgs = $('img');
			
			var imgsSrc = [];
			var imgBase64 = [];
			var imageSuffix = [];//图片后缀
			var zip = new JSZip();
		    zip.file("readme.txt", "案件详情资料\n");
		    var img = zip.folder("images");
		    
			for(var i=0;i<imgs.length;i++){
				var src = imgs[i].getAttribute("src");
				var suffix = src.substring(src.lastIndexOf("."));
				imageSuffix.push(suffix);
				
				 getBase64(imgs[i].getAttribute("src"))
		            .then(function(base64){
		            	imgBase64.push(base64.substring(22));
		            	 
		            },function(err){
		                  console.log(err);//打印异常信息
		            }); 
		           
			}
			function tt(){
				setTimeout(function(){
					if(imgs.length == imgBase64.length){
						for(var i=0;i<imgs.length;i++){
							img.file(i+imageSuffix[i], imgBase64[i], {base64: true});
						}
						zip.generateAsync({type:"blob"}).then(function(content) {
					        saveAs(content, "images.zip");
					    });
					    $('#status').text('处理完成。。。。。');
					    
					}else{
						$('#status').text('已完成：'+imgBase64.length+'/'+imgs.length);
						tt();
					}
				},100);
				
			}
			tt();
			
		}
 
    //传入图片路径，返回base64
    function getBase64(img){
        function getBase64Image(img,width,height) {
          var canvas = document.createElement("canvas");
          canvas.width = width ? width : img.width;
          canvas.height = height ? height : img.height;
 
          var ctx = canvas.getContext("2d");
          ctx.drawImage(img, 0, 0, canvas.width, canvas.height);
          var dataURL = canvas.toDataURL();
          return dataURL;
        }
        var image = new Image();
        image.crossOrigin = 'Anonymous';
        image.src = img;
        var deferred=$.Deferred();
        if(img){
          image.onload =function (){
            deferred.resolve(getBase64Image(image));
          }
          return deferred.promise();
        }
      }
    
</script>
	</body>
</html>
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