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function convertBase64UrlToFileOrBlob(dataURI,type=0) { 	var arr = dataURI.split(','), mime = arr[0].match(/:(.*?);/)[1],		  bstr = atob(arr[1]),fileExt = mime.split('/')[1], n = bstr.length, u8arr = new Uint8Array(n);//$window.atob 	while(n--){		u8arr[n] = bstr.charCodeAt(n);	}         if(type){	        return new Blob([u8arr], {type:mime});           }else{            return new File([u8arr],"file_"+Date.parse(new Date())+fileExt,{type:mime});        }      } function importImage(myChart,graphName){         //base64 转 blob         //var dataURI = encodeURIComponent(myChart.getDataURL("png"));          var dataURI = myChart.getDataURL("png");//base64文件         var $FileOrBlob = convertBase64UrlToFileOrBlob(dataURI,0);         var formData = new FormData();           //console.log($FileOrBlob);           formData.append("file", $FileOrBlob,"file_"+Date.parse(new Date())+".png");           $http({            url:baseurl + '/data/graph/upload',            method: "POST",             transformRequest: angular.identity,            headers: {"Content-Type":undefined}             data:formData        }).then(function successCallback(response) {//blob            // 请求成功执行代码                      }, function errorCallback(response) {            // 请求失败执行代码         });      }

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