如何处理微信小程序开发中全局变量缓存的问题

这篇文章主要介绍了如何处理微信小程序开发中全局变量缓存的问题，具有一定借鉴价值，感兴趣的朋友可以参考下，希望大家阅读完这篇文章之后大有收获，下面让小编带着大家一起了解一下。

这个问题的出现是因为，在input的事件，我没有找到更好的能监听键盘收回的方法，也是为了更好的用户体验吧，所以随之而来的问题就是全局变量，在赋值之后用户退出这个页面，全局变量被微信缓存了，然后造成，用户输入过一次之后，修改手机号失败的bug。

let Btel = &＃39;&＃39;,//防止用户恶意修改手机号
    Byzm = &＃39;&＃39;;

handleTel(e) {// 这里修改用户输入的手机号
        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}):&＃39;&＃39;;
    },    handleGetYzm() {        let reg = common.telReg,
            val = this.data.tel;    
        if (!reg.test(val)) {
               wx.showModal({
                content:&＃39;请输入正确的手机号&＃39;,
                showCancel:false,
                confirmColor:&＃39;#3cc51f&＃39;,//默认值为#3cc51f
                success:res =>{                    if(res.confirm){
                        this.setData({
                            tel:&＃39;&＃39;
                        })         
                    }
                }
            })
        }else {//发送验证码的时候用全局变量的手机号
            Btel = val;// 这里是全局的手机号    
            this.setData({
                isReset : true,
                isNoClick: true
            })
            const data ={
                tel:val//传的是全局变量 
            };
            utils.sendRequest(api.YanZhengMa, data, this.handleGetYzmSucc.bind(this));
            //button 定时器            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)
        }
        
            
    },

//然后这一步是校验了用户在请求完验证码接口后 有没有修改手机好 然后保存handleSave() {        let name = this.data.name,
            telNum = this.data.tel,
            yzm = Byzm,
            status = this.data.isYzm,
            card = wx.getStorageSync(&＃39;UserCard&＃39;);        let timestamp= new Date().getTime();        if (yzm == &＃39;&＃39;) {
            wx.showModal({
                content:&＃39;请输入验证码.&＃39;,
                showCancel:false,
                confirmColor:&＃39;#3cc51f&＃39;
            })            return false;
        }        if (name!=&＃39;&＃39;&&telNum!=&＃39;&＃39;) {            if(Btel != telNum) {
                utils.showModal(&＃39;手机号发生变化，请重新获取验证码。&＃39;);
            }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(&＃39;请填写完整信息哟&＃39;);
        }
    },

// 然后在 保存成功之后 用户点击确定  清空 全局变量  也可以在隐藏和卸载的生命周期里面清空全局变量。
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:&＃39;绑定成功~&＃39;,
                showCancel:false,
                confirmColor:&＃39;#3cc51f&＃39;,//默认值为#3cc51f
                success:res =>{                    if(res.confirm){
                        Byzm = &＃39;&＃39;;//对小程序全局变量缓存进行清除                        if (go) {
                            wx.redirectTo({
                              url: &＃39;/pages/user/cash/cash&＃39;
                            })
                        }else {                            if (id != 0) {                                let card = wx.getStorageSync(&＃39;UserCard&＃39;);
                                card.distribution_id = id;
                                card.distribution_level = lv;
                                wx.setStorageSync(&＃39;UserCard&＃39;,card);
                                wx.setStorageSync(&＃39;seller&＃39;, true)
                            }
                            wx.switchTab({
                              url: &＃39;/pages/user/index&＃39;
                            })
                        }         
                    }
                }
            }) 
            return false
        }else {
            utils.showModal(res.data.err_msg);
        }
    }

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