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通过css伪元素实现连线箭头

表格代码： <el-table v-loading="listLoading" :data="tableData" height="600px" max-height="600px" border fit highlight-current-row style="width: 100%; margin-top: 20px" @sort-change="sortChange"

let data=$("#rep_form").serialize() $.ajax({ type : "post", url : global_url + '/DS8K/add_repair_record', data : data, dataType : 'json', contentType: "application/x-www-form-urlencoded; charset=UTF-8", success:function