JavaScript 超时

Question

每次我在沙箱环境中运行这段代码时，我都会超时并最终崩溃。我已经通过多个 IDE 运行它，但仍然找不到任何语法错误。如果有人看到了我没有看到的东西，我将非常感谢您的意见。

//assign variables to memory
var carModel = new Array()
var milesDriven = new Array()
var gallonsUsed = new Array()
var milesperGallon = new Array()
var questionState, epaRating, conditionofVehicle, totalAverage;

var runningAverage = 0;
var i = 0;

do {
    //retrieve basic information about vehicle from standard input: model, miles, gallons
    carModel[i] = prompt("What type of vehicle do you drive?");
    milesDriven[i] = parseInt(prompt("How many miles have you 
                                   driven with this vehicle?"));
    gallonsUsed[i] = parseInt(prompt("How many gallons of gas have you used when driving this  vehicle?"));

    //calculate miles per gallon
    milesperGallon[i] = milesDriven[i] / gallonsUsed[i];
    runningAverage = runningAverage + milesperGallon[i];

    do {
        questionState = prompt("Do you have any more vehicles that you would like to enter? If yes, type 'yes'. If no, type 'no'.");
    } while (questionState != "yes" && questionState != "no");

    i++;
} while (questionState == "yes");

totalAverage = runningAverage / i;

// parse through each element of carModel, milesDriven, gallonsUsed
for (var j = 0; j <= i; j++) {
    //determine performance standards based upon M.P.G of vehicle
    if (milesperGallon[j] >= 38) {
        conditionofVehicle = "Good";
        epaRating = 10;
        //output the performance standards to user
        document.writeln("Your" + " " + carModel[j] + " " + "receives" + " " + milesperGallon[j] + " " + "miles per gallon.");
        document.writeln("Based upon this metric your vehicle is in" + " " + conditionofVehicle + " " + "condition and has a EPA rating of" + " " + epaRating + ".");
    } else if (milesperGallon[j] >= 31 && milesperGallon[j] < 38) {
        conditionofVehicle = "Good";
        epaRating = 9;
        //output the performance standards to user
        document.writeln("Your" + " " + carModel[j] + " " + "receives" + " " + milesperGallon[j] + " " + "miles per gallon.");
        document.writeln("Based upon this metric your vehicle is in" + " " + conditionofVehicle + " " + "condition and has a EPA rating of" + " " + epaRating + ".");
    } else if (milesperGallon[j] >= 27 && milesperGallon[j] < 31) {
        conditionofVehicle = "Good";
        epaRating = 8;
        //output the performance standards to user
        document.writeln("Your" + " " + carModel[j] + " " + "receives" + " " + milesperGallon[j] + " " + "miles per gallon.");
        document.writeln("Based upon this metric your vehicle is in" + " " + conditionofVehicle + " " + "condition and has a EPA rating of" + " " + epaRating + ".");
    } else if (milesperGallon[j] >= 23 && milesperGallon[j] < 27) {
        conditionofVehicle = "Fair";
        epaRating = 7;
        //output the performance standards to user
        document.writeln("Your" + " " + carModel[j] + " " + "receives" + " " + milesperGallon[j] + " " + "miles per gallon.");
        document.writeln("Based upon this metric your vehicle is in" + " " + conditionofVehicle + " " + "condition and has a EPA rating of" + " " + epaRating + ".");
    } else if (milesperGallon[j] >= 22 && milesperGallon[j] < 23) {
        conditionofVehicle = "Fair";
        epaRating = 6;
        //output the performance standards to user
        document.writeln("Your" + " " + carModel[j] + " " + "receives" + " " + milesperGallon[j] + " " + "miles per gallon.");
        document.writeln("Based upon this metric your vehicle is in" + " " + conditionofVehicle + " " + "condition and has a EPA rating of" + " " + epaRating + ".");
    } else if (milesperGallon[j] >= 19 && milesperGallon[j] < 22) {
        conditionofVehicle = "Fair";
        epaRating = 5;
        //output the performance standards to user
        document.writeln("Your" + " " + carModel[j] + " " + "receives" + " " + milesperGallon[j] + " " + "miles per gallon.");
        document.writeln("Based upon this metric your vehicle is in" + " " + conditionofVehicle + " " + "condition and has a EPA rating of" + " " + epaRating + ".");
    } else if (milesperGallon[j] >= 17 && milesperGallon[j] < 19) {
        conditionofVehicle = "Fair";
        epaRating = 4;
        //output the performance standards to user
        document.writeln("Your" + " " + carModel[j] + " " + "receives" + " " + milesperGallon[j] + " " + "miles per gallon.");
        document.writeln("Based upon this metric your vehicle is in" + " " + conditionofVehicle + " " + "condition and has a EPA rating of" + " " + epaRating + ".");
    } else if (milesperGallon[j] >= 15 && milesperGallon[j] < 17) {
        conditionofVehicle = "Bad";
        epaRating = 3;
        //output the performance standards to user
        document.writeln("Your" + " " + carModel[j] + " " + "receives" + " " + milesperGallon[j] + " " + "miles per gallon.");
        document.writeln("Based upon this metric your vehicle is in" + " " + conditionofVehicle + " " + "condition and has a EPA rating of" + " " + epaRating + ".");
    } else if (milesperGallon[j] >= 13 && milesperGallon[j] < 15) {
        conditionofVehicle = "Bad";
        epaRating = 2;
        //output the performance standards to user
        document.writeln("Your" + " " + carModel[j] + " " + "receives" + " " + milesperGallon[j] + " " + "miles per gallon.");
        document.writeln("Based upon this metric your vehicle is in" + " " + conditionofVehicle + " " + "condition and has a EPA rating of" + " " + epaRating + ".");
    } else if (milesperGallon[j] >= 0 && milesperGallon[j] < 13) {
        conditionofVehicle = "Bad";
        epaRating = 1;
        //output the performance standards to user
        document.writeln("Your" + " " + carModel[j] + " " + "receives" + " " + milesperGallon[j] + " " + "miles per gallon.");
        document.writeln("Based upon this metric your vehicle is in" + " " + conditionofVehicle + " " + "condition and has a EPA rating of" + " " + epaRating + ".");
    } else {
        document.writeln(" ");
    }
}
// check to make sure there is an input value
if (totalAverage >= 0) {
    document.writeln("You have" + " " + i + " " + "vehicles." + " " + "Between them      
                   they average" + " " + totalAverage + " " + "miles per gallon.");
}

Answer 1

您不能将字符串拆分为多行:

milesDriven[i] = parseInt(prompt("How many miles have you 
                               driven with this vehicle?"));

应该是:

milesDriven[i] = parseInt(prompt("How many miles have you driven with this vehicle?"));

与此行类似:

if (totalAverage >= 0) {
    document.writeln("You have" + " " + i + " " + "vehicles." + " " + "Between them      
                   they average" + " " + totalAverage + " " + "miles per gallon.");
}

应该是:

if (totalAverage >= 0) {
    document.writeln("You have" + " " + i + " " + "vehicles." + " " + "Between them they average" + " " + totalAverage + " " + "miles per gallon.");
}

当我做出这些改变时，它对我有用。