<el-button @click="getCode()" :class="{'disabled-style':getCodeBtnDisable}" :disabled="getCodeBtnDisable">{{codeBtnWord}}</el-button>

data() {
     return {
        loginForm: {
            phoneNumber: '',
            verificationCode: '',
        },
        codeBtnWord: '获取验证码', // 获取验证码按钮文字
        waitTime:61, // 获取验证码按钮失效时间
    }
}

computed: {
    // 用于校验手机号码格式是否正确
    phoneNumberStyle(){
        let reg = /^1[3456789]\d{9}$/
        if(!reg.test(this.loginForm.phoneNumber)){
            return false
        }
        return true
    },
    // 控制获取验证码按钮是否可点击
    getCodeBtnDisable:{
        get(){
            if(this.waitTime == 61){
                if(this.loginForm.phoneNumber){
                    return false
                }
                return true
            }
            return true
        },
        // 注意：因为计算属性本身没有set方法，不支持在方法中进行修改，而下面我要进行这个操作，所以需要手动添加
        set(){} 
    }
}

.el-button.disabled-style {
    background-color: #EEEEEE;
    color: #CCCCCC;
}

getCode(){
    if(this.phoneNumberStyle){
        let params = {}
        params.phone = this.loginForm.phoneNumber
        // 调用获取短信验证码接口
        axios.post('/sendMessage',params).then(res=>{
            res = res.data
            if(res.status==200) {
                this.$message({
                    message: '验证码已发送，请稍候...',
                    type: 'success',
                    center:true
                })
            }
        })
        // 因为下面用到了定时器，需要保存this指向
        let that = this
        that.waitTime--
        that.getCodeBtnDisable = true
        this.codeBtnWord = `${this.waitTime}s 后重新获取`
        let timer = setInterval(function(){
            if(that.waitTime>1){
                that.waitTime--
                that.codeBtnWord = `${that.waitTime}s 后重新获取`
            }else{
                clearInterval(timer)
                that.codeBtnWord = '获取验证码'
                that.getCodeBtnDisable = false
                that.waitTime = 61
            }
        },1000)
    }
}