清除input默认样式，纯css自定义input checkbox样式

两种方式~

一种是自己写一个checkbox的样式，如下：

input[type="checkbox"]{
  width:0.64rem;
  height:0.64rem;
  display: inline-block;
  text-align: center;
  vertical-align:baseline; 
  line-height: 0.64rem;
  position: relative;
  border-radius: 50%;
  outline: none;
  -webkit-appearance: none;
  border:1px solid #fff;
  -webkit-tab-highlight-color: rgba(0,0,0,0);
  color: #fff;
  background: #fff;
}
input[type="checkbox"]::before{
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  background: #fff;
  width: 100%;
  height: 100%;
  border: 1px solid #999999;
  border-radius: 50%;
  color: #fff;
}
input[type="checkbox"]:checked::before{
  content: "\2713";
  background-color: #657AFE;
   border: 1px solid #657AFE;
  position: absolute;
  top: 0;
  left: 0;
  width:100%;
  color:#fff;
  font-size: 0.52rem;
  border-radius: 50%;
}
input[type="checkbox"]:disabled::before{
    background: #eee;
    cursor: default;
}

显示为

另外一种为用用背景图写下他的默认样式，如下：

input[type="checkbox"]{
  width:0.6rem;
  height:0.6rem;
  display: inline-block;
  text-align: center;
  vertical-align: -0.09rem;
  line-height: 0.6rem;
  position: relative;
  border-radius: 50%;
  outline: none;
  -webkit-appearance: none;
  background: none;
  border:none;
}
input[type="checkbox"]::before{
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  background: url('/h5/img/app/select.png') no-repeat;
  background-size: 0.6rem;
  width: 100%;
  height: 100%;
  border-radius: 50%;
  color: #fff;
}
input[type="checkbox"]:checked::before{
  content: "";
  background: url('/h5/img/app/selected.png') no-repeat;
  background-size: 0.6rem;
  position: absolute;
  top: 0;
  left: 0;
  width:100%;
  color:#fff;
  font-size: 0.52rem;
  border-radius: 50%;
}
input[type="checkbox"]:disabled::before{
    background: #bbb;
    cursor: default;
    border:1px solid #999;
    box-sizing: border-box;
}

显示为：