核心思想就是監(jiān)聽document的click/touchstart
用contains這個方法去判斷點擊的元素是否在區(qū)域外

    mounted() {
        document.addEventListener('click', this.handleDocumentClick);
        document.addEventListener('touchstart', this.handleDocumentClick);
    },
    
    methods: {
            handleDocumentClick(e) {
                if (!this.$el.contains(e.target)) {
                    this.isShow = false;
                } 
        }
    }