onEditorReady() {       const  that = this;       wx.createSelectorQuery().select('#editor').context(function (res) {         that.editorCtx = res.context;         res.context.setContents({           html: that.data.value         })       }).exec()     },     imageOnLoad: function(e) {       var that = this;       wx.createSelectorQuery().in(this).select(".classTaskDetail").boundingClientRect(function(e) {         if (e) {           that.setData({             height: e.height.toFixed(0)           });         }       }).exec();     }, 请问下怎么才能正确获取，