检测图片是否加载完成

way 1:

function imgLoad(img, callback) {
    var timer = setInterval(function () {
        if (img.complete) {
            callback(img)
            clearInterval(timer)
        }
    }, 50)
}

imgLoad(img, () => {
    this.autoImg()
})

way 2:

img.onload = () => {
    this.autoImg()
}