element UI table 表头合计

image.png image.png
image.png

 handleSelectionChange(val) {
                    // console.log(val)
                    var arrr = []
                    var price=0
                    for (var i = 0; i < val.length; i++) {
                        price = this.addFun( parseFloat(price) ,parseFloat(val[i].invoice_fee))
                        // 合计金额
                        this.heji= price
                    }
                    // console.log(val)
                      if (val.length == 0){
                        this.heji='0.00'
                    }
                },
                addFun(data1, data2){
                    var r1, r2,m;
                    try {
                        r1 = data1.toString().split(".")[1].length
                    } catch (e) {
                        r1 = 0
                    }
                    try {
                        r2 = data2.toString().split(".")[1].length
                    } catch (e) { 
                        r2 = 0 
                    }
                    m = Math.pow(10, Math.max(r1, r2))
                    return (data1 * m + data2 * m) / m
                },