优化js，我这个js验证太长了,太大了谁有办法验证时候简略点？

Question

    function invalidate()
            {
               //日期不能为空
               document.getElementById("lblFcRefuelDateTime").innerHTML="";
               if (document.getElementById("txtFcRefuelDateTime").value=='')
               {    document.getElementById("lblFcRefuelDateTime").innerHTML="日期不能为空";
                    document.getElementById("txtFcRefuelDateTime").focus();
                    return  false  ;  }
              
               //txt只读 没什么用了
               if (   result =/^\d{4}-\d{2}-\d{2}$/.test(document.getElementById("txtFcRefuelDateTime")))
               {
                    document.getElementById("lblFcRefuelDateTime").innerHTML="请填写正确的加油日期";
                    document.getElementById("txtFcRefuelDateTime").focus();
                    return  false  ;
               }
                 //不能大于今天的日期
                 var textTime=  document.getElementById("txtFcRefuelDateTime").value;
                 var nowDate = new Date();
                 var nowTime=  nowDate.format("yyyy-MM-dd");
               if ( textTime > nowTime)
               {
                    document.getElementById("lblFcRefuelDateTime").innerHTML="日期不能大于今天";
                    document.getElementById("txtFcRefuelDateTime").focus();
                    return  false  ;
               }
                document.getElementById("lblFcRefuelDateTime").innerHTML="";                             
               //不能小于 上一条记录日期
                 var  backTime =  document.getElementById("hdnOldFcTime").value;
                 backTime=  backTime.toString("yyyy-MM-dd");
               //alert(backTime); 
               if( backTime > textTime )
               {    document.getElementById("lblFcRefuelDateTime").innerHTML="时间不能小于上一条记录";
                    document.getElementById("txtFcRefuelDateTime").focus();
                    return  false  ;
               }
               document.getElementById("lblFcRefuelDateTime").innerHTML="";
               // 请填写燃油类型
                if (document.getElementById("sltFcFuelType").selectedIndex==0)
               {   document.getElementById("lblFcFuelType").innerHTML="请选择燃油类型";
                   document.getElementById("sltFcFuelType").focus();
                   return  false  ;
               }
               //请填写加油数
                if (document.getElementById("txtFcRefuel").value=='')
               {    document.getElementById("lblFcRefuel").innerHTML="请填写加油数";
                    document.getElementById("txtFcRefuel").focus();
                    return  false  ;
               }
               //验证小数
               var str=document.getElementById("txtFcRefuel").value;
               var pattern =/^[0-9]+([.]\d{1,2})?$/;
               if(!pattern.test(str)){
                     document.getElementById("lblFcRefuel").innerHTML="请输入数字(例:0.00),最高保留两位小数";      
                     document.getElementById("txtFcRefuel").focus();
                     return false;
                }
               //加油数要大于0
                if (document.getElementById("txtFcRefuel").value< 1 ){
                    document.getElementById("lblFcRefuel").innerHTML="加油数必须大于0";
                    document.getElementById("txtFcRefuel").focus();
                     return  false  ;
               }
                    document.getElementById("lblFcRefuel").innerHTML="";
               //里程表读数
                if (document.getElementById("txtFcTripMeter").value=='')
               {    document.getElementById("lblFcTripMeter").innerHTML="请填写里程表读数";
                    document.getElementById("txtFcTripMeter").focus();
                    return  false  ;
               }
                  //验证小数
               var str=document.getElementById("txtFcTripMeter").value;
               var pattern =/^[0-9]+([.]\d{1,2})?$/;
               if(!pattern.test(str))
               {
                   document.getElementById("lblFcTripMeter").innerHTML="请输入数字(例:0.00),最高保留两位小数";      
                   document.getElementById("txtFcTripMeter").focus();
                 return false;
                }
                //里程数要大于0
                if (document.getElementById("txtFcTripMeter").value< 1 )
               {    document.getElementById("lblFcTripMeter").innerHTML="里程数不能为负";
                    document.getElementById("txtFcTripMeter").focus();
                    return  false  ;
               }
               document.getElementById("lblFcTripMeter").innerHTML="";
                //读数表 不能小于上一次
               var oldvalue = parseFloat( document.getElementById("hdnOldFcTripMeter").value);
               var nowvalue =  parseFloat( document.getElementById("txtFcTripMeter").value);
               if (oldvalue >= nowvalue)
               {   document.getElementById("lblFcTripMeter").innerHTML="不能小于或者等于上一次读数";
                   document.getElementById("txtFcTripMeter").focus();
                   return  false  ;
               }
               ///所有验证结束后 打开窗口 补充信息
                   var s="<%=specId%>" ;
                 
                    if(s==0)
                        {    document.getElementById ("divUpdateSpec").style.display ="";
                             return false ;
                        }
              return true ;
              }

Answer 1

这个函数的功能就是验证所有textbox控件的内容 在submit前验证 如果有问题 返回false就不提交了。。
谁有好的方法让它简化简化。。又长又大 又不利于维护。

Answer 2

var g=function(id){return document.getElementById(id)}

Answer 3

其他方面 还能优化吗？这个能减少大小 但是长度不见少啊function aaa(id){return document.getElementById(id)}
var thecontrol=aaa("txtFcTripMeter");
 if (thecontrol.value< 1 )
               {    thecontrol.innerHTML="里程数不能为负";
                    document.getElementById("txtFcTripMeter").focus();
                    return  false  ;
               }是这个意思吧

Answer 4

写个公共函数参数valiate（id,reg,tip)封装一下

Answer 5

http://kb.cnblogs.com/a/500871/这种方法是不是用到jQuery

Answer 6

同意归纳一下就能优化参考：
var invalidates = 
[
["txtFcRefuelDateTime", "lblFcRefuelDateTime", /^\d{4}-\d{2}-\d{2}$/, "日期不能为空"], 
["txtFcRefuel", "lblFcRefuel", /^[0-9]+([.]\d{1,2})?$/, "请输入数字(例:0.00),最高保留两位小数"], 
["txtFcTripMeter", "lblFcTripMeter", /^[0-9]+([.]\d{1,2})?$/, "请输入数字(例:0.00),最高保留两位小数"]
];function $(id) { return document.getElementById(id); }for (var i = 0; i < invalidates.length; i++) {
$(invalidates[i][1]).innerHTML = "";
if (invalidates[i][2].test($(invalidates[i][0]).value) {
$(invalidates[i][1]).innerHTML = invalidates[i][3];
$(invalidates[i][0]).focus();
break;
}
}

Answer 7

function $(id) { return document.getElementById(id); }
为什么要加个 $的符号？

Answer 8

$只是一个自定义的函数名，你可以定义“fromID、gebi、a”，定义为$主要是大多数人的习惯。估计是受到jquery的影响。不定义也可以，直接用document.getElementById，可以理解为$就是document.getElementById的简写。（jquery除外）
for (var i = 0; i < invalidates.length; i++) {
    document.getElementById(invalidates[i][1]).innerHTML = "";
    if (invalidates[i][2].test(document.getElementById(invalidates[i][0]).value) {
        document.getElementById(invalidates[i][1]).innerHTML = invalidates[i][3];
        document.getElementById(invalidates[i][0]).focus();
        break;
    }
}一个常用方法，使用简写可以减少代码的字节，节省一点带宽。

Answer 9

改了几个，LZ看下合不合适... - -! function $(id){
return document.getElementById(id);
}
function msg(lblId, msg, txtId){
$(lblId).innerHTML = msg;
$(txtId).focus();
return false;
}
function invalidate() {
//日期不能为空
$("lblFcRefuelDateTime").innerHTML = "";
if ($("txtFcRefuelDateTime").value == '') {
return msg("lblFcRefuelDateTime", "日期不能为空", "txtFcRefuelDateTime");
} //txt只读 没什么用了
if (result = /^\d{4}-\d{2}-\d{2}$/.test($("txtFcRefuelDateTime"))) {
return msg("lblFcRefuelDateTime", "请填写正确的加油日期", "txtFcRefuelDateTime");
}
//不能大于今天的日期
var textTime = new Date($("txtFcRefuelDateTime").value.replace(/-/g, "//"));
if (textTime > new Date()) {
return msg("lblFcRefuelDateTime", "日期不能大于今天", "txtFcRefuelDateTime");
}
$("lblFcRefuelDateTime").innerHTML = "";
//不能小于 上一条记录日期
                  ......