请问这2段代码那段效率更高一点?还能优化一下吗?

[j5782r3qan23]

1.
var radioButton1 = document.getElementById("<%=RadioButton1.ClientID %>");
var radioButton2 = document.getElementById("<%=RadioButton2.ClientID %>");
var radioButton3 = document.getElementById("<%=RadioButton3.ClientID %>");
var radioButton4 = document.getElementById("<%=RadioButton4.ClientID %>");

if(radioButton1.checked)
{
document.getElementById("tdDeliverWay").innerText = radioButton1.value;
return;
}
if(radioButton2.checked)
{
document.getElementById("tdDeliverWay").innerText = radioButton2.value;
return;
}
if(radioButton3.checked)
{
document.getElementById("tdDeliverWay").innerText = radioButton3.value;
return;
}
if(radioButton4.checked)
{
document.getElementById("tdDeliverWay").innerText = radioButton4.value;
return;
}
2.
var radioButton1 = document.getElementById("<%=RadioButton1.ClientID %>");
var radioButton2 = document.getElementById("<%=RadioButton2.ClientID %>");
var radioButton3 = document.getElementById("<%=RadioButton3.ClientID %>");
var radioButton4 = document.getElementById("<%=RadioButton4.ClientID %>");

var str = "";
if(radioButton1.checked)
{
str = radioButton1.value;
}
if(radioButton2.checked)
{
str = radioButton2.value;
}
if(radioButton3.checked)
{
str = radioButton3.value;
}
if(radioButton4.checked)
{
str = radioButton4.value;
}
从节省资源,提升效率上来讲,那个好点?还是都一样的?我要是想优化一下的话,还能怎么改?

[j5782r3qan23]

第2段代码最后加上
document.getElementById("tdDeliverWay").innerText = str;

[chen_ya_ping]

建议用第二个。第二个的那个document.getElementById("tdDeliverWay").innerText = radioButton1.value; 太多，太长。其实你的的代码还是有很多的地方可以优化。

[humin1906]

性能上讲,肯定是第一个来的好，但是这个也是微不足道的.
代码的可读性来讲就第二个要好多了,当然还可以再优化

[humin1906]

你的代码本身有问题..第一个和第二个的结果是不一样的.

[zzxap]

  function $(str)
{
return document.getElementById(str);

}
var radioButton1 = $(" <%=RadioButton1.ClientID %>"); 
        var radioButton2 = $(" <%=RadioButton2.ClientID %>"); 
        var radioButton3 =$(" <%=RadioButton3.ClientID %>"); 
        var radioButton4 = $(" <%=RadioButton4.ClientID %>"); 
        
        if(radioButton1.checked) 
        { 
            $("tdDeliverWay").innerText = radioButton1.value; 
            return; 
        } 
        if(radioButton2.checked) 
        { 
            $("tdDeliverWay").innerText = radioButton2.value; 
            return; 
        } 
        if(radioButton3.checked) 
        { 
            $("tdDeliverWay").innerText = radioButton3.value; 
            return; 
        } 
        if(radioButton4.checked) 
        { 
            $("tdDeliverWay").innerText = radioButton4.value; 
            return; 
        }