Ajax synchronously verifies whether the order number exists

This article mainly introduces the method of ajax synchronous verification of the existence of a single number, involving the operation skills related to data interaction based on ajax. Friends in need can refer to it. I hope it can help everyone.

//保存前执行的方法,ajax同步调用后台验证包裹单号是否存在
function doBeforeSave(){
  var packageCode=document.getElementById("packageCode").Value;
  var temp=false;
  if(packageCode!=""){
    $.ajax({
     url: "${ctx}/finance/packageManagement!parcelsWhetherExists.do", //接收页面
     type: 'post',  //POST方式发送数据
     async: false,  //ajax同步
     data:{packageCode:packageCode},
     success: function(result) {
      temp = eval(result.result);
     }
    });
  }
  if(!temp){
   alert("包裹单号已存在！");
   toft.resetForm("addDataForm");//清空表单
   toft.id("packageCode").focus();
  }
  return temp;
}

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