解决ElementUI 自定义验证 validate 函数不执行的问题

<span slot="footer">
    <el-button v-on:click="visible = false">取消</el-button>
    <el-button v-on:click="onSubmit('ruleForm')" style="background-color: #000;color: #fff;">提交</el-button>
</span>

onSubmit(formName) {
    this.$refs[formName].validate((valid) => {
        console.log('进来了')

        ...其它逻辑
    })
}

rules: {
    SMSChannel: [
        { required: true, message: '请选择', trigger: 'change' }
    ],
    Mobile: [
        { required: true, message: '请输入手机号码', trigger: 'blur' },
        { validator: validatorMobile, message: '请输入正确的手机号码'}
    ],
    email: [
        { required: true, message: '请输入邮箱', trigger: 'blur' },
        { pattern: emailReg, message: '请输入正确的邮箱' }
    ],
    code: [
        { required: true, message: '请输入验证码' }
    ],
    name: [
        { required: true, message: '请输入姓名', trigger: 'blur' },
        { min: 2, max: 20, message: '长度在2-20个字符', trigger: 'blur' },
        // { type: 'string',message:'格式不正确',trigger: 'blur', required: true, pattern: /^[\u2E80-\u9FFF\.A-Za-z]{1,}\s*[\u2E80-\u9FFF\.A-Za-z]{1,}$/}
    ],
    Birthday: [
        { required: true, message: '请选择生日' }
    ],
    Gender: [
        { required: true, message: '请选择性别' }
    ],
    location: [
        { required: true, message: '请选择所在地' }
    ],
    address: [
        { required: false, message: '请选择国家/地区' }
    ],
    //shopAddress: [
    //    { required: true, message: '请选择店铺所在地' }
    //],

    channel: [
        { required: false, message: '请选择' }
    ],
    phoneOrEmail: [
        { required: true, message: '请输入联系电话', trigger: 'blur' }
    ]
}

let validatorMobile = (rule, value, callback) => {
    const reg = mobileReg
    if (!reg.test(this.ruleForm.Mobile)) {
        //this.$message({
        //    showClose: true,
        //    message: '请先填写正确的手机号码',
        //    type: 'warning'
        //});
        return callback("请先填写正确的手机号码");
    }
    return callback();
}

如图，调试的时候，我在validate内部打印了一句话，打开调试工具，发现怎么也不执行。调试了半天，终于发现了问题，同事在进行手机号自定义校验的时候没有进行callback回调。callback函数没有执行，validate函数就不会执行，之后我加了callback代码逻辑后，validate函数就正常执行了。