<el-form-item label="订货日期" label-width="80px">
      <el-date-picker size="small" type="daterange" v-model="OrderDate" value-format="yyyy-MM-dd"
          range-separator="至"
          start-placeholder="开始日期"
          end-placeholder="结束日期">
       </el-date-picker>
 </el-form-item>

var app = new Vue({
            el: "#app",
            data() {
                return {

                    OrderDate: ‘‘,
                };
            }
})

   var url = "/OrderingArea/SearchData?orderDate=" + _this.OrderDate ; //第一种方式
   var date = _this.OrderDate == "" ? "" : _this.OrderDate.join(","); //选择的时间是数组，需要转换
   var url = "/OrderingArea/SearchData";
   $.ajax({
   url: url,
   type:"POST"   //一般为post，用get会有问题，容易被截取内容
   async:false,
   dataType:"json",
   data:{orderDate:date},
   success:function(result){
//  里面写业务逻辑
    }
}）;