想限制editor长度该如何处理？？？绑定改变事件改变内容，可是粘贴还是可以粘贴进去

      wx.getSetting({           success: function (e) {             console.log(e.authSetting['scope.userLocation'])             let userLocation = e.authSetting['scope.userLocation']             if (typeof userLocation === 'undefined') {             // 用户第一次授权地理位置             // 1、获取当前位置坐标               wx.getLocation({                 type: 'wgs84',                 success: res => {                 // 2、根据坐标获取当前位置名称，显示在顶部:逆地址解析                   console.log('地址', res)                   that.address = res.latitude + ',' + res.longitude                   wx.request({                     url:                     'http://api.map.baidu.com/reverse_geocoding/v3/?ak=&output=json&coordtype=wgs84ll&location=' + res.latitude + ',' + res.longitude,                     data: {},                     header: {                       'Content-Type': 'application/json'                     },                     success: function (res) {                       console.log(res)                       that.cityName = res.data.result.addressComponent.city                                 }                   })                 }               })             } else {             // 用户点了允许授权之后 又设置不允许获取位置的处理             }           }         }) 用户第一次同意授权后第二次怎么直接拿到地址？？？？