修改element-ui源码兼容el-date-picker支持年区间选择

问题描述：el-date-picker原本用的是monthrange月区间选项，后来想改成年区间，el官网没有这个组件，下面是结合百度搜索+实际情况，已经过测试给出的结果！

1、引入组件

<el-date-picker
  v-model="value"
  type="yearrange"
  align="right"
  unlink-panels
  range-separator="至"
  :format="yyyy"
  :value-format="yyyy"
  :start-placeholder="beginDate"
  :end-placeholder="endDate"
></el-date-picker>

//type="yearrange"这是重点

2、下载2文件替换js文件

点击下载

找到node_moduleselement-uilibdate-picker.js替换掉
找到node_moduleselement-uilibelement-ui.common.js替换掉

3、在element-ui/index.css新增以下样式

.el-year-table td {
    padding: 8px 0;
}
.el-year-table td  div {
    height: 48px;
    padding: 6px 0;
    box-sizing: border-box;
}
.el-year-table td div .cell {
    height: 36px;
    line-height: 36px;
    border-radius: 18px;
}
.el-year-table td.start-date div {
    border-top-left-radius: 24px;
    border-bottom-left-radius: 24px;
}
.el-year-table td.end-date div {
    border-top-right-radius: 24px;
    border-bottom-right-radius: 24px;
}
.el-year-table td.in-range div {
    background-color: #f2f6fc;
}
.el-year-table td.start-date .cell,
.el-year-table td.end-date .cell {
    color: #fff;
    background-color: #409eff;
}
.el-year-table td.today.start-date .cell,
.el-year-table td.today.end-date .cell {
    color: #fff;
}