var dxnr = this.data.dxnr(this.data.dxnr是将要被编辑的textarea)
var cursor = this.data.cursor;
var sliceStr1 = dxnr.slice(0, cursor)
var sliceStr2 = dxnr.slice(cursor)
console.log(sliceStr1, sliceStr2)
dxnr = sliceStr1 + this.data.commonList[id].cyynr + sliceStr2;