未捕獲ReferenceError：總成本未定義

Question

我已經反覆查看，但似乎無法找到問題。當我在Google Chrome的JavaScript控制檯中加載腳本時，它會將以下錯誤返回給我 Uncaught referenceerror: total cost is not defined。這發生在document.getElementById("answer").innerHTML代碼中。

我試圖分割公式，給它另一個名字，重新組合公式，但它仍然給我同樣的錯誤。

//waarde vasthouden 
    function calcul(){ 
    var fund = parseFloat(document.getElementById("fund").value); 
    var age1 = parseFloat(document.getElementById("age1").value); 
    var age2 = parseFloat(document.getElementById("age2").value); 
    var age3 = parseFloat(document.getElementById("age3").value); 
    var age4 = parseFloat(document.getElementById("age4").value); 
    var age5 = parseFloat(document.getElementById("age5").value); 
    var age6 = parseFloat(document.getElementById("age6").value); 
    var primcost = parseFloat(document.getElementById("primcost").value); 
    var seccost = parseFloat(document.getElementById("seccost").value); 
    var unicost = parseFloat(document.getElementById("unicost").value); 
    var start = parseFloat(document.getElementById("start").value); 
    var annrate = parseFloat(document.getElementById("annrate").value); 
    //additional calculations 
    //Duration primary school 
    var primdur = (age2 - age1) + 1; 
    //Present Value Primary School before starting 
    var pvprim = primcost * ((1 - (Math.pow((1 + (annrate/100)), primdur)))/(annrate/100)); 
    //Duration secondary school 
    var secdur = (age4 - age3) + 1; 
    //Present Value secondary School before starting 
    var pvsec = seccost * ((1 - (Math.pow((1 + (annrate/100)), secdur)))/(annrate/100)); 
    //Duration university 
    var unidur = (age6 - age5) + 1; 
    //Present Value university before starting 
    var pvuni = unicost * ((1 - (Math.pow((1 + (annrate/100)), unidur)))/(annrate/100)); 
    //Present value when starting primary school 
    //var X1 = ((pvprim)/(Math.pow((1 + (annrate/100)), (age1 - 1)))); 
    //Present value when starting secondary school 
    //var X2 = ((pvsec)/(Math.pow((1 + (annrate/100)), (age3 - 1)))); 
    //Present value when starting university 
    //var X3 = ((pvuni)/(Math.pow((1 + (annrate/100)), (age5 - 1)))); 
    //Annual deposits (PV formula) 
    var totalcost = ((pvprim)/(Math.pow((1 + (annrate/100)), (age1 - 1)))) + 
    ((pvsec)/(Math.pow((1 + (annrate/100)), (age3 - 1)))) + 
    ((pvuni)/(Math.pow((1 + (annrate/100)), (age5 - 1)))); 
    var othcalc = (1/(annrate/100)) - ((1/((annrate/100)*(Math.pow((1 + (annrate/100)), age5))))); 
    } 

//binnen in script resterende decimal code, nadat alle variabelen zijn gedefinieerd 
     var decs = +(document.getElementById('dec').value); 
     calculated = true; //end of decimal code 

//Eindantwoord weergeven in decimalen 
document.getElementById("answer").innerHTML =(((totalcost) - fund)/othcalc).toFixed(decs); 
</script> 

這是因爲我的var totalcost不正確，或者是這是因另一個錯誤呢？內置的Google Sites HTML-box不會給我任何錯誤，但是JSconsole可以。

Answer 1

您在函數calcul中打包的所有變量都在不同的範圍內，所以它們只能在此函數內部使用。在JavaScript中，當你開始一個新的功能時，你正在定義一個新的範圍。

您將不得不在calcul函數中設置innerHTML，或者以某種方式返回需要的值（即返回JavaScript對象）。

你有的第二個問題是，在你嘗試使用你正在計算的值之前，你沒有調用函數。

請嘗試以下

function calcul() { 
    // Your calculation logic goes here 
    return { "fund": fund, "totalcost": totalcost, "othcalc": othcalc }; 
} 

var decs = +(document.getElementById('dec').value); 
var results = calcul(); 
document.getElementById("answer").innerHTML =(((results.totalcost) - results.fund)/results.othcalc).toFixed(decs); 

Answer 2

定義totalcost爲全局變量，這樣你就可以在函數範圍外訪問totalcost值。

var totalcost; // define this var outside of function calcul() 

在你

function calcul() { 

     // here replace `var totalcost` with `totalcost` 

}