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<!DOCTYPE html>
<html>
<head>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width">
  <title>JS Bin</title>
</head>
<body>
 <div class="radiogroup">
    <div class="radiobtn radiobtn-1">
      <div class="circular">
        <div class="circular-inner"></div>
      </div>
      <label>是</label>
    </div>
    <div class="radiobtn radiobtn-2">
      <div class="circular">
        <div class="circular-inner"></div>
      </div>                
      <label>否</label>
    </div>
  </div>
</body>
</html>
 
/*单选按钮*/
.radiogroup {
  font-size: 26px;
  text-indent: 14px;
}
.radiogroup label {
  vertical-align: middle;
}
.radiogroup .radiobtn {
  display: inline-block;
  margin-right: 20px;
}
.circular {
  position: relative;
  display: inline-block;
  width: 30px;
  height: 30px;
  -webkit-border-radius: 30px;
  -moz-border-radius:   30px;   
  border-radius: 30px;
  border: 2px solid #dedfe0;
  background: #fff;
  vertical-align: middle;
}
.circular-inner {
  position: absolute;
  top: 0;
  right: 0;
  bottom: 0;
  left: 0;
  display: none;
  margin: auto;
  width: 16px;
  height: 16px;
  -webkit-border-radius: 16px;
  -moz-border-radius:   16px;
  border-radius: 16px;
  background: #009fe8;
}
.active .circular-inner {
  display: block;
}
 
// 判断是否已经有className
    function elementhasClassName(ele,className) {
      var classReg= new RegExp('(^|\\s)'+className+'(\\s|$)');
      return classReg.test(ele.className);
    };
    //dom 增加class
    function addClass(ele,className) {
      if (elementhasClassName(ele,className)) {
        return;
      } else if(ele.className === ''){
        ele.className += className;
      } else {
        ele.className += ' '+className;
      }
    };  
    //移除className
    function removeClass(ele,cls) {
      var regTxt='(^|\\s)'+cls+'(\\s|$)';
      ele.className = ele.className.replace((new RegExp(regTxt)),"");
    };
    var radioGroup = document.querySelectorAll('.radiobtn');
    for (var i = radioGroup.length - 1; i >= 0; i--) {
      function bindEvent(ele){
        ele.addEventListener('click',function(event) {
          var target = event.currentTarget; 
          // 点击未选中的radio
          if (elementhasClassName(target,'radiobtn') && !elementhasClassName(target,'active')&& !elementhasClassName(target,'active')) {
            var radioGroup = target.parentNode;
            var radiobtnGroup =radioGroup.querySelectorAll('.radiobtn');
            for (var i = radiobtnGroup.length - 1; i >= 0; i--) {
              function remove(ele,currentTarget){
                if (ele !== currentTarget && elementhasClassName(ele,'active')) {
                  removeClass(ele,'active');
                };
              };
              remove(radiobtnGroup[i],target);
            };  
            addClass(target,'active');
          };
        });
      };
      bindEvent(radioGroup[i]);
    };
Output

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