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申し訳ありませんが、これは明らかに私の初めてのことです。JavaScriptでの作業方法を学んでいます。私の質問はこれです：私は私たちの非営利団体のためのサービスの価格を決定するいくつかの基本的な計算を持っています。tは部屋の数*0.81です。ただし、月額最低$60があります。したがって、それを価格設定関数にどのように組み込むかを知る必要があります。「x<60なら60」ということになるのは知っていますが、言語がどのように書かれるかはわかりません。完全なjsを含めます。

var listenerFieldIDs = {"roomCountID":"item4_text_1"}; //Currently the only form we are using for room count has this value set as its ID attribute.

var impactFields = ["item12_text_1","item1_text_1","item16_text_1","item18_text_1","item20_text_1"]; //Field IDs for the form that will be changed constantly.
var estimatedBottleSize = 1.5, occupancyRate = (60 / 100), collectionDuration = 365, soapOuncesRecoverable = 0.63, bottleOuncesRecoverable = 0.47,lbConversion = 0.0626, rate = 0.81;

var $ = function(id){ //Shortcut to save some typing. Instead of having to write out document.getElementById(elementID) every time I need to access an element, I can put $(elementID).property or $(elementID).method() I need more easily.
    return document.getElementById(id);
}

var updateFormField = function(id,amount){ //Updates a form field when gives the element ID and the amount.
    $(id).value = amount;
}

var updateForm = function(roomCount){ 

    // This is called when all form data needs to be updated. This is generally invoked each time a keystroke in the room count field.
    updateFormField(impactFields[0],calculateLbsOfSoap(roomCount).toFixed(2)); //Updating the first form field after calculating the total weight of soap in lbs.
    updateFormField(impactFields[1],calculateLbsOfBottles(roomCount).toFixed(2)); //Same thing as above, but bottles/amenities.
    updateFormField(impactFields[2],calculateBarsOfSoap(roomCount).toFixed(0)); //Updating the third form field after calculating the total number of distributed units.
    updateFormField(impactFields[3],calculateBottles(roomCount).toFixed(0)); //Same as above, but bottles/amenities.
    updateFormField(impactFields[4],("$" + calculatePrice(roomCount).toFixed(2))); //Updating price.
}

var listenForNumbers = function(event){ //This function is acting as a handler for when anything is entered into the field.
    updateForm($(listenerFieldIDs["roomCountID"]).value);
}

var calculateLbsOfSoap = function (rmCnt){ // Calculate the weight of soap and return the amount.
    return checkCount(rmCnt) ? 0 : ((soapOuncesRecoverable * lbConversion) * (rmCnt * occupancyRate) * collectionDuration); 
}

var calculateLbsOfBottles = function (rmCnt){ // Calculate the weight of bottled amenities and return the amount.
    return checkCount(rmCnt) ? 0 : ((bottleOuncesRecoverable * lbConversion) * (rmCnt * occupancyRate) * collectionDuration);
}

var calculateBarsOfSoap = function(rmCnt){ // Calculate how many bars are distributed if the room count is not 0.
    return checkCount(rmCnt) ? 0 : ((calculateLbsOfSoap(rmCnt) * 16) / 3);
}

var calculateBottles = function(rmCnt){ // Calculate how many bottles are distributed if the room count is not 0.
    return checkCount(rmCnt) ? 0 : (((calculateLbsOfBottles(rmCnt) * 16) / estimatedBottleSize) * (2 / 3)); 
}

var calculatePrice = function(rmCnt){

    return checkCount(rmCnt) ? 0 : (rmCnt * rate);
    }


var checkCount = function(count){ //If the count is 0  or less than 0, the number is useless so just return 0 to prevent odd results.
    return (count < 0 || count == 0) ? true : false; 
}

var initializeRealTimeCalcToForm = function(){ 



    if(window.attachEvent){
        $(listenerFieldIDs["roomCountID"]).attachEvent("onkeydown",listenForNumbers,false);
        $(listenerFieldIDs["roomCountID"]).attachEvent("onkeyup",listenForNumbers,false);
        $(listenerFieldIDs["roomCountID"]).attachEvent("onkeypress",listenForNumbers,false);
        $(listenerFieldIDs["roomCountID"]).attachEvent("onchange",listenForNumbers,false);
    } else{
    //But if NOT IE... :-D
        $(listenerFieldIDs["roomCountID"]).addEventListener("keydown",listenForNumbers,false);
        $(listenerFieldIDs["roomCountID"]).addEventListener("keyup",listenForNumbers,false);
        $(listenerFieldIDs["roomCountID"]).addEventListener("keypress",listenForNumbers,false);
        $(listenerFieldIDs["roomCountID"]).addEventListener("change",listenForNumbers,false);
    }

}

window.onload = function(){  

    initializeRealTimeCalcToForm();
}
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1 に答える 1

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変数に 60 の最小値のみを設定する場合は、次のmyvarようにします。

myvar=Math.max(60,myvar);

編集：

calculatePrice次に、 によって返される値を少なくとも 60 にしたい場合は、次を使用します。

var calculatePrice=function(rmCnt){
    return Math.max(60,checkCount(rmCnt) ? 0 : (rmCnt * rate));
}

注 1:

このように関数を宣言できることを知っていますか?

function calculatePrice(rmCnt){
    return Math.max(60,checkCount(rmCnt) ? 0 : (rmCnt * rate));
}

より短く、このようにして関数を宣言する前に呼び出すことができます!

注 2:

その値を少なくとも 60 にしたい場合、次のコードがわかりません。

checkCount(rmCnt) ? 0

なぜ0？

于 2012-08-28T02:21:03.540 に答える