electron+elementui+vue.js environment:

<el-select v-model="monitorList[0].resolutionValue" placeholder="" @change="changeResolution">
  <el-option v-for="item in monitorList[0].modes" :key="item.width+"x"+item.height" :label="item.width+"x"+item.height" :value="item.width+"x"+item.height">
  </el-option>
</el-select>

    changeResolution() {
      console.log("changeResolution")
      console.log("this.monitorList[0].resolutionValue:",this.monitorList[0].resolutionValue)
      return true
    },

use the mouse to change the 1440x900 in the drop-down box el-select to 1920x1080, and the console.log here prints out this.monitorList [0] .accountionValue has become 1920x1080, but it is still displayed as 1440x900 on the interface.