paper_download.js

var downLoad = function(imgArray){
	this.arr = [];
	this.imgCount = 0;
	this.imgArray = imgArray;
	this.imgLength = imgArray.length;
	this.transfer = 0;
}
downLoad.prototype.getImg = function(){
	console.log(this.imgArray)
	var imgArray = this.imgArray;
	for(var i = 0; i < imgArray.length; i++){
		var src = imgArray[i].src;
		imgArray[i].setAttribute('crossOrigin', 'anonymous');
		this.requestImg(imgArray[i],src);
	}
}
downLoad.prototype.requestImg = function(img,src){
	var _this = this
	var src = src;
	img.src = src;
	img.onerror = function(){
		var timeStamp = +new Date();
		_this.requestImg(img,src+'?'+timeStamp);
	}
	img.onload = function(){
		_this.imgCount++;
	}
}
downLoad.prototype.getBase64Image = function(image,ext){
	var canvas = document.createElement("canvas");
	canvas.width = image.width;
	canvas.height = image.height;
	var context = canvas.getContext("2d");
	context.drawImage(image,0,0,image.width,image.height);
	
	// 杩欓噷鏄笉鏀寔璺ㄥ煙鐨�
	var base64 = canvas.toDataURL("image/"+ext);
	return base64;
}
downLoad.prototype.init = function(dom,target,fileName,paperSize){
	var _this = this;
	var targetId = targetId || 'content';
	var fileName = fileName || 'content';
	var paperSize = paperSize || 'a4';
	this.getImg();
	dom.onclick = function(){
		document.body.scrollTop = document.body.scrollHeight - screen.height;
		document.body.scrollTop = 0;
		try{
			//杩欓噷鍙互闅愯棌椤甸潰澶氫綑鐨勫唴瀹�
			//$('.test-lists').find('.test-lists-bottom,.test-lists-sy,.test-lists-xy,.test-lists-score,.test-lists-remove').hide();
		}catch(e){
			console.log('涓嶆槸鍐呭');
		}
		target.style.background = 'white';
		if(_this.imgCount == _this.imgArray.length){
			if(_this.transfer == 0){
				for(var i = 0; i < _this.imgArray.length; i++){
				_this.arr.push(_this.getBase64Image(_this.imgArray[i],'png'))
				}
				for(var i = 0; i < _this.arr.length; i++){
					_this.imgArray[i].src = _this.arr[i];
				}
				_this.transfer = 1;
			}
			renderPDF(target,fileName,paperSize, function(){
				_this.arr = [];
				try{
					//杞崲鎴愬姛鍚庤繕鍘熼殣钘忕殑鍐呭
					//$('.test-lists').find('.test-lists-bottom,.test-lists-sy,.test-lists-xy,.test-lists-score,.test-lists-remove').show();
				}catch(e){
					console.log('涓嶆槸鍐呭');
				}
        	});
		}
	}
}