vue+element from表单验证为空时不callback

Question

正常情况下input框为空是可以callback，但是点击获取验证码的时候如果input为空没有callback，但是输入错误格式的内容就有callback，
求大神帮忙看看，帮忙解决一下，贴下代码
`
export default {

data(){
    var emailAdd = (rule, value, callback) => {
        if(value === ''){
            callback(new Error('请输入邮箱地址'));
        }else if(value !==''){
            if(!this.checkEmail(value)){
                callback(new Error('请输入正确的邮箱地址'))
            }else{
                // 调用后台接口判断邮箱是否已经使用
                callback();
            }
        }else{
            callback();
        }
    }
    return{
        emailRule:{
            emailAddress:[
                { required: true, validator: emailAdd, trigger: 'blur' }
            ],
        }
    }
 },
 methods:{
     //点击获取验证码
     verifyEmail(){
         let email = this.emailForm.emailAddress
        if(this.checkEmail(email)){
            console.log(email)
            const TIME_COUNT = 60;
            if (!this.timer) {
                this.count = TIME_COUNT;
                this.emailShow = false;
                this.timer = setInterval(() => {
                if (this.count > 0 && this.count <= TIME_COUNT) {
                        this.count--;
                    } else {
                        this.emailShow = true;
                        clearInterval(this.timer);
                        this.timer = null;
                    }
                }, 1000)
            }
        }
     },
     checkEmail(str) {
        let emailReg = /^[a-zA-Z0-9_.-]+@[a-zA-Z0-9-]+(\.[a-zA-Z0-9-]+)*\.[a-zA-Z0-9]{2,6}$/;
        if (emailReg.test(str)) {
            return true;
        } else {
            return false;
        }
    },
 }

}
`

Answer 1

var emailAdd = (rule, value, callback) => {
        if(value === ''){
            callback(new Error('请输入邮箱地址'));
        }else if(!this.checkEmail(value)){
            callback(new Error('请输入正确的邮箱地址'))
        }else{
            callback();
        }
    }