<> one , Original code 
<el-form-item class="form_bigt_p" label=" Project start and end time :" prop="time"> <el-date-picker 
unlink-panels class="bigWidth" :disabled="isDisabled" v-model.trim="
ruleForm.time" type="daterange" value-format="timestamp" range-separator=" to " 
start-placeholder=" Start date " end-placeholder=" End date " ></el-date-picker> </
el-form-item> 
 <> Because the data returned by the background is two  yyyy-mm-dd  Date of format (startTime,endTime), So we started with 
this.ruleForm.time = [ this.baseDateTemp(res.data.startTime), this.baseDateTemp
(res.data.endTime), ]; //this.baseDateTemp It is a global method of converting date to time stamp  
 <> two , Problem finding and handling 
 <> problem 
 The date can be rendered in the  el-date-picker  upper , But it will not be echoed when it is modified 
  After testing, it was found that , This can be triggered  input  method , But it doesn't trigger  change  method 
 <> Treatment method 
 stay  input  It can be seen from the method , On modification ,el-date-picker  Bound  v-model  The value of has changed , But there is no real-time update in the control 
  The final choice is to adopt  this.$set  Method to update the data , And successfully solve this problem 
  The revised code is as follows 
<el-form-item class="form_bigt_p" label=" Project start and end time :" prop="time"> <el-date-picker 
unlink-panels class="bigWidth" :disabled="isDisabled" v-model.trim="
ruleForm.time" type="daterange" value-format="timestamp" range-separator=" to " 
start-placeholder=" Start date " end-placeholder=" End date " @input="testClick" ></
el-date-picker> </el-form-item> testClick(e) { this.$nextTick(() => { this.
ruleForm.time = null; this.$set(this.ruleForm, "time", [e[0], e[1]]); }); }, // 
 Convert the two dates obtained in the background to time The method is changed to  this.$set(self.ruleForm, "time", [ this.baseDateTemp(res
.data.startTime), this.baseDateTemp(res.data.endTime) ]); 
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