利用css3修改input[type=radio]樣式

<form>
    <div>
        <input id="item1" type="radio" name="item" value="選項一" checked>
        <label for="item1"></label>
        <span>選項一</span>
    </div>
    <div>
        <input id="item2" type="radio" name="item" value="選項二">
        <label for="item2"></label>
        <span>選項二</span>
    </div>
</form>

　　

div {
            position: relative;
            line-height: 30px;
        }
        
        input[type="radio"] {
            width: 20px;
            height: 20px;
            opacity: 0;
        }
        
        label {
            position: absolute;
            left: 5px;
            top: 3px;
            width: 20px;
            height: 20px;
            border-radius: 50%;
            border: 1px solid #999;
        }
        
        /*設置選中的input的樣式*/
        /* + 是兄弟選擇器,獲取選中后的label元素*/
        input:checked+label { 
            background-color: #fe6d32;
            border: 1px solid #fe6d32;
        }
        
        input:checked+label::after {
            position: absolute;
            content: "";
            width: 5px;
            height: 10px;
            top: 3px;
            left: 6px;
            border: 2px solid #fff;
            border-top: none;
            border-left: none;
            transform: rotate(45deg)
        }

　　源碼鏈接：http://runjs.cn/code/hmevb9gs