长按识别二维码

tips[index].onclick=function(){

var w = $("#app").width();
var h = $("#app").height();
var canvas=document.createElement("canvas")
canvas.width = w * 2;
canvas.height = h * 2;
canvas.style.width = w + "px";
canvas.style.height = h + "px";
var context = canvas.getContext("2d");
context.scale(2,2);

html2canvas($('#app'),{
canvas:canvas,
onrendered: function (canvas) {

setTimeout(function(){
$('#app').css('display','none')

$("#showimg").show()
$("#showimg").attr('src', canvas.toDataURL());
},2000)



}
})

}