ElMessageBox.prompt('', '验证取货码', {
 inputPattern: /^.{1,20}$/,
    inputErrorMessage: '请输入取货码',
    inputPlaceholder: '请输入取货码',
    beforeClose: (action, instance, done) => {
        if (action === 'confirm') {
            if (instance.inputValue) {
                let flag = false;
                if (flag) {
                    done()
                } else {
                    ElMessage.error('取货码错误');
                    return
                }
            }
        }
        done();
    }
});