使用onClick属性：

 < input type =radioname =r1value =10onClick =document.getElementById（'hidfield'）。value = this.value/> 10 
< br / &GT; 
< input type =radioname =r1value =45onClick =document.getElementById（'hidfield'）。value = this.value/> 
 45 
< br /> 
< input type =hiddenname =sumvalue =id =hidfield/> 
 

I want to change the value of hidden input field when radio buttons selected :

    <input type="radio" name="r1" value="10" />10
    <br/>
    <input type="radio" name="r1" value="45" />45
    <br/>
    <input type="hidden" name="sum" value="" />

for example when user click on one the buttons the value of hidden field change to that value.

Use the onClick property:

<input type="radio" name="r1" value="10" onClick="document.getElementById('hidfield').value=this.value"/>10
    <br/>
    <input type="radio" name="r1" value="45" onClick="document.getElementById('hidfield').value=this.value"/>
    45
    <br/>
    <input type="hidden" name="sum" value="" id="hidfield" />