报错信息

未修改前的代码

html

<el-input style="margin-top: 10px" placeholder="请输入验证码" v-model="verificationCode">
            <template slot="prepend">验证码</template>
            <button @click="getCode(formData)" class="code-btn" :disabled="!show">
                <span v-show="show">获取验证码</span>
                <span v-show="!show" class="count">{{count}} s</span>
            </button>
        </el-input>

JS

 new Vue({
        el: '#loginDemo',
        data: {},
        method: { // 问题出处 !!!!!
            open() {
                const h = this.$createElement;
                this.$msgbox({
                    title: '消息',
                    message: h('p', null, [
                        h('span', null, '内容可以是 '),
                        h('i', {style: 'color: teal'}, 'VNode')
                    ]),
                    confirmButtonText: '确定',
                    cancelButtonText: '取消',
                })
            },
            // 倒计时逻辑
            getCode(formData) {
                console.log(formData)
                if (!this.timer) {
                    this.count = TIME_COUNT;
                    this.show = false;
                    this.timer = setInterval(() => {
                        if (this.count > 0 && this.count <= TIME_COUNT) {
                            this.count--;
                        } else {
                            this.show = true;
                            clearInterval(this.timer);
                            this.timer = null;
                        }
                    }, 1000)
                }
            },
        },

解决方案

将 method 修改成 methods