element组件el-table表头设置斜线

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"
             }]
         }
     },

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