$('.erweima').each(function(index){
//循环的逻辑代码
var index = index+1;
var canvas = document.getElementById("myCanvasTOP"+index+"");
var VideoID = $(this).children("input").val()
var ComVideoID=$(this).find(".ComTypeID").html();
var IssHow=$(this).find(".PlayTypeID").html();
if(IssHow==1){
imageToCanvas(canvas,"https://www.284719.com/QrCode.aspx?s=http%3A//m.ybzhan.cn/video/c"+VideoID+".html");
else{
imageToCanvas(canvas,"https://www.284719.com/QrCode.aspx?s=http%3A//m.ybzhan.cn/st"+ComVideoID+"/video_"+VideoID+".html");
)
function imageToCanvas(canvas,url) {
var img = new Image();
console.log(url)
img.src = url;
img.onload = function(){
var ctx = canvas.getContext("2d");
ctx.drawImage(img,0,0);
//console.log(img.width + ":" + img.height);