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需求：根据开始时间，通过填写阶段时长，自动填写结束时间，同时开始时间和节数时间可以手动输入

代码如下：

 <el-form ref="ruleForm2" :rules="rules2" :model="formData" inline label-position="right" label-width="120px"> <el-form-item label="开始时间" prop="beginTime"><el-date-pickerv-model="formData.beginTime"v-elDateFormateditablevalue-format="timestamp"type="date"placeholder="请选择日期"clearablestyle="width: 180px"@change="changeEndTime"/></el-form-item><!-- 添加一个阶段时长 --><el-form-item label="阶段时长" prop="stageDuration"><el-input v-model="formData.stageDuration" style="width: 180px"  @blur="stageDurationBlur" /><span class="span_style">(最小单位半月)</span></el-form-item><el-form-item label="结束时间" prop="endTime"><el-date-pickerv-model="formData.endTime"v-elDateFormateditablevalue-format="timestamp"type="date"placeholder="请选择日期"clearablestyle="width: 180px"/></el-form-item>
</el-form>

    changeEndTime(time) {
//这里是项目的一个判断 与主体逻辑无关if (this.formData.stageNature == 'point') {// this.formData.endTime = this.timestampToYYYYMMDD(time)this.formData.endTime = time} else {this.calculateEndDate()}},stageDurationBlur(e) {if (this.formData.stageNature !== 'point' && this.formData.beginTime &&             e.target.value) {this.calculateEndDate()}},calculateEndDate() {if (this.formData.beginTime && this.formData.stageDuration) {const beginTime = new Date(this.formData.beginTime)const duration = parseFloat(this.formData.stageDuration)if (!isNaN(duration) && duration > 0) {const daysToAdd = Math.floor(duration * 15) // 将输入的值乘以15天const endTime = new Date(beginTime)endTime.setDate(beginTime.getDate() + daysToAdd)this.formData.endTime = endTime.getTime()} else {this.formData.endTime = ''}}},

手动输入日期，默认回显日期功能，我这边后端参数需要的是时间戳，使用时需要看清楚后端需要的数据类型

  watch: {formData: {handler(newValue, oldValue) {if (newValue.beginTime && newValue.beginTime != '') {// 判断有没有横杠  输入的日期 格式是 2024-07-15的，或者是20240715这种 if (typeof newValue.beginTime === 'string' && newValue.beginTime.indexOf('-') == -1) {let str = newValue.beginTimeconst positions = [4, 6]const char = '-'for (let i = positions.length - 1; i >= 0; i--) {const position = positions[i]str = str.substring(0, position) + char + str.substring(position)}this.formData.beginTime = str}} else {this.formData.beginTime = ''}},immediate: true,deep: true}},

效果图：