个人所得税计算

写成一个方法calcMoney

data(){

return{

index:-1, // 个人所得税所属的纳税阶段,
incomeData:[{incomeTax: "0.5",money: 30000}, {incomeTax: "0.8",money: 66000}, {incomeTax: "1",money: 100000}], //个人所得税计算区间，是活的，后台返回的
formData：{

demandBudget:0, // 预算金额，不是固定的，是活的，输入预算金额计算个人所得税，
income:0,// 个人所得税金额

}

}

}

// 个人所得税计算

calcMoney() {

for(let i=0;i<this.incomeData.length;i++){
    if(this.formData.demandBudget<=this.incomeData[i].money){
        this.index = i;
        break;
    }else{
        this.index = -1;
    }
}
if(this.index ===  0){
    // 还未到纳税标准
     this.formData.income = 0
}
else if(this.index>0){
    // 在纳税区间内，未超过最高纳税标准
    let money1 = 0; 
    let money2 = 0; 
    money1 = (this.formData.demandBudget - this.incomeData[this.index-1].money)*this.incomeData[this.index-1].incomeTax*0.01;
    for(let i =0;i<=this.index;i++){
        if(i-2>=0){
           money2 = money2+((this.incomeData[i-1].money-this.incomeData[i-2].money)*this.incomeData[i-2].incomeTax*0.01);
        }

    }
    this.formData.income = money1 + money2;
}
else{
    // 已超过最高纳税金额
    if(this.formData.demandBudget>0){
        let money1 = 0;
        let money2 = 0;
        let leng = this.incomeData.length; // 个人所得税纳税标准条数
        money1 = (this.formData.demandBudget - this.incomeData[leng-1].money)*this.incomeData[leng-1].incomeTax*0.01;
        for(let i =0;i<=leng;i++){
            if(i-2>=0){
                money2 = money2+((this.incomeData[i-1].money-this.incomeData[i-2].money)*this.incomeData[i-2].incomeTax*0.01)
            }

        }
        this.formData.income = money1 + money2;

    }
}

 

}