JS determines if the Radio radio button is selected and pops the value information

Problems solved in today's project: JS to determine if the Radio radio button is selected and pop-up value information, initially always get the value of Radio, and later found that there are some problems in the logic, I would like to share the code to leave notes and share the reference to the brothers who encounter such problems  :

<script type= "Text/javascript" >//Judging a function above 5 radio that is selectedfunctionjudgeradioclicked () {//get radio button name Collection    varRadios = Document.getelementsbyname ("RADIO_TJ"); //traverse the name collection based on the name collection length     for(vari=0;i<radios.length;i++)    {         //Determine which radio button is selected        if(radios[i].checked) {//pops the value of the selected radio buttonalert (radios[i].value); }     } }                            </script>

Note://Get single radio button name collection//var radios = Document.getelementsbyname ("RADIO_TJ"); The "RADIO_TJ" in is the Name property of the radio button collection.

Original address: http://blog.csdn.net/songyanjun2011/article/details/7186864

JS determines if the Radio radio button is selected and pops the value information