如何處理微信小程序開發中全局變量緩存的問題

這篇文章主要介紹了如何處理微信小程序開發中全局變量緩存的問題，具有一定借鑒價值，感興趣的朋友可以參考下，希望大家閱讀完這篇文章之后大有收獲，下面讓小編帶著大家一起了解一下。

這個問題的出現是因為，在input的事件，我沒有找到更好的能監聽鍵盤收回的方法，也是為了更好的用戶體驗吧，所以隨之而來的問題就是全局變量，在賦值之后用戶退出這個頁面，全局變量被微信緩存了，然后造成，用戶輸入過一次之后，修改手機號失敗的bug。

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let Btel = '',//防止用戶惡意修改手機號
    Byzm = '';

handleTel(e) {// 這里修改用戶輸入的手機號
        this.setData({
            tel:e.detail.value 
        })
    },
    handleYzm(e) {
        this.setData({
            Yzm:e.detail.value
        })
        Byzm = e.detail.value;        let psd = this.data.psd,
            yzm = this.data.Yzm;
        yzm == psd ? this.setData({isYzm:0}):'';
    },    handleGetYzm() {        let reg = common.telReg,
            val = this.data.tel;    
        if (!reg.test(val)) {
               wx.showModal({
                content:'請輸入正確的手機號',
                showCancel:false,
                confirmColor:'#3cc51f',//默認值為#3cc51f
                success:res =>{                    if(res.confirm){
                        this.setData({
                            tel:''
                        })         
                    }
                }
            })
        }else {//發送驗證碼的時候用全局變量的手機號
            Btel = val;// 這里是全局的手機號    
            this.setData({
                isReset : true,
                isNoClick: true
            })
            const data ={
                tel:val//傳的是全局變量 
            };
            utils.sendRequest(api.YanZhengMa, data, this.handleGetYzmSucc.bind(this));
            //button 定時器            let time = setInterval(()=>{            let phoneCode = this.data.time;
                phoneCode --
                this.setData({
                    time : phoneCode
                })                if(phoneCode == 0){
                     clearInterval(time)
                     this.setData({
                        isReset : false,
                        isNoClick: false,
                        time:60
                     })
                }
            },1000)
        }
        
            
    },

//然后這一步是校驗了用戶在請求完驗證碼接口后 有沒有修改手機好 然后保存handleSave() {        let name = this.data.name,
            telNum = this.data.tel,
            yzm = Byzm,
            status = this.data.isYzm,
            card = wx.getStorageSync('UserCard');        let timestamp= new Date().getTime();        if (yzm == '') {
            wx.showModal({
                content:'請輸入驗證碼.',
                showCancel:false,
                confirmColor:'#3cc51f'
            })            return false;
        }        if (name!=''&&telNum!='') {            if(Btel != telNum) {
                utils.showModal('手機號發生變化，請重新獲取驗證碼。');
            }else {
                const data ={
                distribution_id:card.distribution_id,
                post:{
                    user_name:name,
                    user_tel:Btel,
                    user_code:yzm
                },
                user_id:card.user_id,
                password:yzm+timestamp
                };
                utils.sendRequest(api.BindTel, data, this.handleSaveTel.bind(this));
            }
        }else {
            utils.showModal('請填寫完整信息喲');
        }
    },

// 然后在 保存成功之后 用戶點擊確定  清空 全局變量  也可以在隱藏和卸載的生命周期里面清空全局變量。
handleSaveTel(res) {        if (res.data.error == 0) {            let go = this.data.go,
                id = res.data.data.id,
                lv = res.data.data.level;
            wx.showModal({
                content:'綁定成功~',
                showCancel:false,
                confirmColor:'#3cc51f',//默認值為#3cc51f
                success:res =>{                    if(res.confirm){
                        Byzm = '';//對小程序全局變量緩存進行清除                        if (go) {
                            wx.redirectTo({
                              url: '/pages/user/cash/cash'
                            })
                        }else {                            if (id != 0) {                                let card = wx.getStorageSync('UserCard');
                                card.distribution_id = id;
                                card.distribution_level = lv;
                                wx.setStorageSync('UserCard',card);
                                wx.setStorageSync('seller', true)
                            }
                            wx.switchTab({
                              url: '/pages/user/index'
                            })
                        }         
                    }
                }
            }) 
            return false
        }else {
            utils.showModal(res.data.err_msg);
        }
    }

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