mutiple reload image on ios12 platform will be crash and the image will not show

[by2017]

// version=5.1.1
var urls = [
"imge1",
"imge2",
"imge3",
"imge1",
"imge2",
"imge3",
]
var echo =0;
var stage;
init();
$("#ontainer").on("touchstart", function(e) {
});
$("#ontainer").on("touchmove", function(e) {
});
$("#ontainer").on("touchend", function(e) {
init();
});
function init() {
var imageUrl = urls[echo];
var stage = new Kinetic.Stage({
container: 'container',
width: 729,
height: 294
});
var layer = new Kinetic.Layer();
var imageObj = new Image();
imageObj.src = imageUrl;
imageObj.onload = function() {
setTimeout(function(){
var yoda = new Kinetic.Image({
x: 200,
y: 200,
image: imageObj,
width: 106,
height: 118
});
layer.add(yoda);
stage.add(layer);
layer.draw();

                $("#test").empty();
                $("#test").append(imageObj);
                // $("#img1").attr("src", imageUrl);

                var canvas = document.getElementById("canvas");
                var ctx = canvas.getContext('2d')
                ctx.drawImage(imageObj, 0, 0)
                echo += 1;
                if (echo > 11) {
                    echo = 0;
                }
            }, 1000);
        };