element组件el-table表头设置斜线

<div>
	<el-table  :data="tableData" border stripe>
                <el-table-column prop="year" label="机械类型" width="150" align="center">
                    <el-table-column prop="year" label="排放参数" align="center" width="150"></el-table-column>
                </el-table-column>
                <el-table-column prop="fenopda" label="挖掘机（千克）" align="center"></el-table-column>
                <el-table-column prop="dwaiod" label="推土机（千克）" align="center"></el-table-column>
                <el-table-column prop="date" label="装载机（千克）" align="center"></el-table-column>
                <el-table-column prop="name" label="叉车（千克）" align="center"></el-table-column>
                <el-table-column prop="province" label="压路机（千克）" align="center"></el-table-column>
                <el-table-column prop="city" label="摊铺机（千克）" align="center"></el-table-column>
                <el-table-column prop="address" label="平地机（千克）" align="center"></el-table-column>
                <el-table-column prop="zip" label="其他（千克）" align="center"></el-table-column>
     </el-table>
</div>

data() {
         return {
         	 //模拟的假数据
             tableData: [{
                 date: '2016-05-03',
                 name: '王小虎',
                 province: '上海',
                 city: '普陀区',
                 address: '上海市普陀区金沙江路',
                 zip: 200333,
                 dwaiod:"154",
                 fenopda:"89",
                 year:"12178"
             }]
         }
     },

核心：

<style scoped>
	/*::v-deep 这里主要的作用就是用来强制修改element默认的样式*/
	::v-deep  .el-table thead.is-group th {
        background: none;
        padding: 0px;
    }

    ::v-deep .el-table thead.is-group tr:first-of-type th:first-of-type {
        border-bottom: none;/*中间的横线去掉*/
    }

    ::v-deep .el-table thead.is-group tr:first-of-type th:first-of-type div.cell {
        text-align: right;/*上边文字靠右*/
    }

    ::v-deep .el-table thead.is-group tr:last-of-type th:first-of-type div.cell {
        text-align: left;/*下边文字靠左*/
    }
	/*核心代码*/
    ::v-deep .el-table thead.is-group tr:first-of-type th:first-of-type:before {
        content: "";
        position: absolute;
        width: 1px;
        height: 100px;/*斜线的长度*/
        top: 0;
        left: 0;
        background-color: grey;
        opacity: 0.2;
        display: block;
        transform: rotate(-43deg);/*调整斜线的角度*/
        transform: rotate(-70deg);/*调整斜线的角度*/
        -webkit-transform-origin: top;
        transform-origin: top;
    }
	
    ::v-deep .el-table thead.is-group tr:last-of-type th:first-of-type:before {
        content: "";
        position: absolute;
        width: 1px;
        height: 100px;/*斜线的长度*/
        bottom: 0;
        right: 0;
        background-color: grey;
        opacity: 0.2;
        display: block;
        transform: rotate(-45deg);/*调整斜线的角度*/
        transform: rotate(-70deg);/*调整斜线的角度*/
        -webkit-transform-origin: bottom;
        transform-origin: bottom;
    }
    ::v-deep .el-table thead.is-group th{
        height: 27.4px;
    }
</style>