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<input id="file" @change="uploadImegs($event,3)" type="file" accept="image/*" />

uploadImegs(e) {
    let _file = e.target.files[0];
    if (_file) {
        if (!/\.(jpg|jpeg|png|JPG|PNG)$/.test(e.target.value)) {
            this.$Message.info("图片类型必须是,jpeg,jpg,png中的一种");
            return false;
        }
        let reader = new FileReader();
        reader.onload = e => {
            var image = new Image();
            image.src = e.target.result;
            image.onload = function() {
                let width = 0
                let height = 0
                console.log("宽" + this.width, "高" + this.height)
            };
            let data;
            data = e.target.result;
            this.cropperData.imgUrl = data;
        };
        reader.readAsDataURL(_file);
    }
    e.target.value = ""
}