element中的select加checkBox_el-select嵌套checkbox

只需要重写select的样式就看可以啦！！！

// 重写el-select下拉选择框
// ******************** //
.dc-multiple-select .el-select-dropdown__item::before {
  content: "";
  position: absolute;
  top: 9px;
  right: 16px;
  font-size: 12px;
  font-weight: bold;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  border: 1px solid #dcdfe6;
  width: 15px;
  height: 15px;
  border-radius: 2px;
}
 
.dc-multiple-select .el-select-dropdown__item.selected::before {
  background-color: #b22;
  border-color: #b22;
}
 
.dc-multiple-select .el-select-dropdown__item.selected::after {
  right: 18px !important;
  color: #fff !important;
}
// ******************** //