将表格变为红色，效果如下图

html代码

<template>
    <div>
        <el-table
        :data="tableData"
        border
        :cell-style="cellStyle"
        style="width: 100%; margin-top: 20px">
        <el-table-column
                prop="name"
                label="姓名">
        </el-table-column>
        <el-table-column
                prop="amount1"
                label="数值 1（元）">
        </el-table-column>
        <el-table-column
                prop="amount2"
                label="数值 2（元）">
        </el-table-column>
        <el-table-column
                prop="amount3"
                label="数值 3（元）">
        </el-table-column>
    </el-table>
    </div>
</template>

js代码

export default {
    
    
        name: "Test",
        data() {
    
    
            return {
    
    
                tableData: [{
    
    
                    name: '王小虎',
                    amount1: '134',
                    amount2: '3.2',
                    amount3: 10
                }, {
    
    
                    name: '王小虎',
                    amount1: '165',
                    amount2: '4.43',
                    amount3: 12
                }, {
    
    
                    name: '黄晓明',
                    amount1: '124',
                    amount2: '1.9',
                    amount3: 9
                }, {
    
    
                    name: '黄晓明',
                    amount1: '621',
                    amount2: '2.2',
                    amount3: 17
                }, {
    
    
                    name: '小王',
                    amount1: '139',
                    amount2: '4.1',
                    amount3: 15
                }, {
    
    
                    name: '小李',
                    amount1: '139',
                    amount2: '4.1',
                    amount3: 15
                }]
            };
        },
        methods: {
    
    
            cellStyle({
    
    row, column, rowIndex, columnIndex}) {
    
    
                let Style1;
                let Style2;
                //表格框变颜色-数值1
                if (row.amount1>300) {
    
    
                    Style1 = 'background: red;color:white';
                }else{
    
    
                    Style1 = '';
                }
                if(columnIndex==1)
                    return Style1;

                //表格框变颜色-数值2
                if (row.amount2<3) {
    
    
                    Style2 = 'background: red;color:white';
                }else{
    
    
                    Style2 = '';
                }
                if(columnIndex==2)
                    return Style2;
            }
        }
    };

第一步：在 el-table 中设置属性 :cell-style=“cellStyle”
第二步：js中写方法cellStyle（）通过判断条件将表格变红，通过列来变红