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es5
/
debt.html

<!DOCTYPE html>
<html>

<head>
    <meta charset="utf-8">
</head>
<style>
</style>

<body>

</body>
<script>
    var benjin = 570000;
    var monthdebt = 3062.18;
    // var interest = 0.0433;
    var interest = 0.2033;

    var totalInterest = 0;
    var totaldebt = 0;

    var months = 304;
    console.log('总共要还贷款：' + months*monthdebt);
    console.log('本金：'+ benjin +'-投资收益率：' + interest);

    for(var i = 1; i <= months; i++){
        // if(benjin<=0){
        //     console.log('本金已耗尽')
        //     break;
        // }
        var monthlyInterest = benjin * interest / 12;
        totalInterest += monthlyInterest;
        benjin -= monthdebt;
        benjin += monthlyInterest;
        totaldebt+=monthdebt;
        console.log('第'+ i +'个月---本金剩余：'+ benjin + '-当月利息：'+ monthlyInterest + '-投资总利息：' + totalInterest + '-本月房贷还款：' + monthdebt + '-已还贷款金额：' + totaldebt);
    }

    var total = 570000;
    for(var j = 1; j<=20; j++){
        total += total * interest;
    }
    console.log(total)
</script>

</html>