用javascript判断radio单选框是否被选中,用javascript判断radio单选框是否被选中,我们以选择性别为例:
用javascript判断radio单选框是否被选中,用javascript判断radio单选框是否被选中,我们以选择性别为例:
用javascript判断radio单选框是否被选中,用javascript判断radio单选框是否被选中,我们以选择性别为例:

html代码:
<span>性别:</span><span>男</span><input type="radio" value="1" name="sex" id="sex" />
<span>女</span><input type="radio" value="2" name="sex" id="sex" />
js代码:
<script type="text/javascript">
var sex_obj = document.getElementsByName('sex');
var temp_sex = false;
for(var i = 0; i < sex_obj.length; i ++){
if(sex_obj[i].checked){
var sex = sex_obj[i].value;
temp_sex = true;
break;
}
}
if(temp_sex == false){
alert('请选择性别');
return false;
}
</script>