mui上传单图片onload事件不执行，请问怎么解决

function uploadImage(imgPath) {  
    console.log("imgPath = " + imgPath);  
    var image = new Image();  
    image.src = imgPath;  
    console.log("imgPath1= " + image.src);  
    image.onload= function(){  
        console.log("imgPath2 = " + imgPath);  
        var imgData = getBase64Image(image);  
        console.log("imgPath3 = " + imgPath);  
        /*在这里调用上传接口*/  
        mui.ajax("图片上传接口", {  
            data: {  
                imgData: imgData  
            },  
            dataType: 'json',  
            type: 'GET ',  
            timeout: 10000,  
            success: function(data) {  
                if(data == "200") {  
                    console.log('上传成功');  
                } else {  
                    mui.toast('图片上传失败，请稍后再试！');  
                }  
            },  
            error: function(xhr, type, errorThrown) {  
                mui.toast('网络异常，请稍后再试！');  
            }  
        });  
    }  
}