使用elementUI的表格table给列添加样式

	<el-table
		:data="saveTableData.tableData"
		:key="datarefersh" //通过改变此属性进行数据重新渲染
		@header-click="handleHeaderClick"
		highlight-current-row
		@current-change="handleCurrentRowChange"
		ref="table"
		:header-cell-class-name="handlemyclass"
		>
			<el-table-column
				:render-header="labelHead"
				v-for="(item, index) in eleTable.headerData"
				:column-key="item.idenCode"
				:prop="item.idenCode"
				:label="item.idenName"
				:key="index"
				:idenType="item.idenType"
				:class-name="item.current ? 'cellSelected' : ''"
				></el-table-column>
             </el-table>

 	         data() {  
 	            choose:0,//根据点击表头时将表头的code值赋值给choose进行判断
 	             datarefersh: true,
 	        }
             init(){
                this.eleTable.headerData.map(o => {
				o.current = false;//初始化时将渲染的表头每一项添加current属性，列根据current判断是否点击，从而高亮它
				});
             },
            //点击行事件
            handleCurrentRowChange(val) {
		     	this.table.selectedColumn={} //清空列数据
				let list = false;
				//判断是否有列选中
				this.eleTable.headerData.map(o => {
					if (o.current === true) {
						list = true;
					}
				});
				
				if (list === true) {
				    //有列选中时，将列的current属性重置为false
					this.eleTable.headerData.map(o => {
						o.current = false;
					});
					this.datarefersh = !this.datarefersh;
					setTimeout(() => {
						this.$refs["table"].setCurrentRow(val);
						this.choose=0//将表格头图标选中状态也重置
						this.table.selectedRow = val;
					}, 100);
				} else {
					 this.table.selectedRow = val;
				}
			},
			//点击表头事件
			handleHeaderClick(column, event) {
				this.table.selectedRow={} //清空行数据
				let idenCode = column.property;
				for (let i in this.eleTable.headerData) {
				if (this.eleTable.headerData[i].idenCode == idenCode) {
				//该列为选中的列
					let headData = this.eleTable.headerData[i];
				if (this.table.selectedColumn.property == idenCode) {
						//取消选择
						this.table.selectedColumn = {};
						headData.current = false;
						this.choose=0
						this.datarefersh = !this.datarefersh;
				} else {
						this.table.selectedColumn = column;
						headData.current = true;
						this.choose=column.property
						this.datarefersh = !this.datarefersh;
				   }
		    	} else {
						return;
						}
					}
				}
			},
	//表头函数类
			handlemyclass: function({ column}) 
			 {
			let text=[]
				//动态给表格头是数字属性的添加未选中图标
			for(var i in this.saveTableData.tableData[0]){
			if(typeof(this.saveTableData.tableData[0][i])==="number"){
					text.push(i)
				}		 
			}
		//不在数字指标数组内的执行testB类，只高亮
		//在指标内且choose为当前的选中code的执行选中类（testC）,不是当前选中的执行未选中内testA
			if (text.includes(column.columnKey)) {
	           return   this.choose===column.columnKey?"testC":"testA";
				} else {
			 return "testB";
				}		
			},
//第二种方法
			//点击表头事件
			handleHeaderClick(column, event) {
				let idenCode = column.property;
				for (let i in this.eleTable.headerData) {
					if (this.eleTable.headerData[i].idenCode == idenCode) {
						let headData = this.eleTable.headerData[i];
						if (headData.idenType == 2) {
							if (
								headData.hasOwnProperty("isIndCalculate") &&
								headData.isIndCalculate
							) {
								//指标运算的列不参与单列运算
								return;
							}
							//数字指标
							let th = "";
							if ($(event.target).hasClass("is-leaf")) {
								th = $(event.target);
							} else {
								th = $(event.target)
									.parent()
									.parent();
							}
							let className = $(th).attr("class");
							let newName=className.replace("el-table__cell", "");
							let newclassName = newName.replace("is-leaf", "");
							$(".tableLayer tr th, .tableLayer tr td").removeClass("active");
							if (this.table.selectedColumn.property == idenCode) {
								//取消选择
								this.table.selectedColumn = {};
								headData.current = false;
							} else {
								this.table.selectedColumn = column;
								$("." + newclassName).addClass("active");
							}
						} else {
							return;
						}
					}
				}
			},

	.testA,.testB,.testC {
		background: #257ac1!important;
		color: "#fff";
	}
	.testA::before{
		display: block;
		content: '';
		background: url("../../../../../../assets/select-bg/setA.png") no-repeat;
		background-size: 100% 100%;
		position: absolute;
       right: 8px;
       top: 12px;
       width: 12px;
       height: 12px;
	}
		.testC::before{
		display: block;
		content: '';
		background: url("../../../../../../assets/select-bg/setB.png") no-repeat;
		background-size: 100% 100%;
		position: absolute;
    right: 8px;
    top: 12px;
    width: 12px;
    height: 12px;
	}