Question

	var first = prompt("It is a great time outside, isn't it? (yes / no)");
	first = "yes";
	if (first) {
		alert("I do agree with you, cool! Now let's see if you can complete next task");
	} else {
		alert("Sorry but you are wrong");
	}
	var a = +prompt("How many trunks does an elephant have?");
	a = 1;
	var b = +prompt("How many legs has a human body?");
	b = 2;
	var c = +prompt("How many planets are there in the Solar system?");
	c = 9;
	if (a,b,c) {
		alert("Perfect! You've answered 3 questions correct"); <!--i allways get this one, no matter if its all wrong... -->
	} else if (a !== 1 && b !== 2 && c !== 9) {
		alert("Sorry, you did not answer any question correct");
	} else if (a == 1 && b !== 2 && c !== 9 || a !== 1 && b == 2 && c !== 9 || a !== 1 && b !== 2 && c == 9) {
		alert("Bad! you gave only 1 correct answer");
	} else if (a == 1 && b == 2 && c !== 9 || a !== 1 && b == 2 && c == 9 || a == 1 && b !== 2 && c == 9) {
		alert("Not bad! You've answered 2 questions correct");
	}

那么什么是正确的代码？记住它必须是初级水平，我正在训练基础知识。提前谢谢

Answer 1

我认为这是一个简单的错误，即你的第一个条件不符合你的想法。

   if(a == 1 && b == 2 && c == 9)

是你的第一个条件。

此外，在上面的行中，您不应该将a，b和c设置为这些值。

    var a = +prompt("How many trunks does an elephant have?");
    a = 1;
    var b = +prompt("How many legs has a human body?");
    b = 2;
    var c = +prompt("How many planets are there in the Solar system?");
    c = 9;

应该是

    var a = +prompt("How many trunks does an elephant have?");
    var b = +prompt("How many legs has a human body?");
    var c = +prompt("How many planets are there in the Solar system?");

否则，无论提示返回什么，都会覆盖该值。

Answer 2

您没有正确测试答案，您应该在一个语句中阅读用户答案，然后在另一个语句中使用它进行测试

 var a = +prompt("How many trunks does an elephant have?");//reading the user input
 if(a==1)//testing the if user input is equals to the correct answer
 {...}

var first = prompt("It is a great time outside, isn't it? (yes / no)");
	
	if (first=="yes") {
		alert("I do agree with you, cool! Now let's see if you can complete next task");
	} else {
		alert("Sorry but you are wrong");
	}
	var a = prompt("How many trunks does an elephant have?");
	var b = prompt("How many legs has a human body?");
	var c = prompt("How many planets are there in the Solar system?");
  var correctanswerscount = 0;

     if (a==1)
  correctanswerscount++;
    if (b==2)
  correctanswerscount++;
    if (c==9)
  correctanswerscount++;
  
	if(correctanswerscount == 3) {
		alert ("Perfect! You've answered 3 questions correct");
	} else if (correctanswerscount == 0) {
		alert("Sorry, you did not answer any question correct");
	} else if (correctanswerscount == 1) {
		alert("Bad! you gave only 1 correct answer");
	} else if (correctanswerscount == 2) {
		alert("Not bad! You've answered 2 questions correct");
	}

Answer 3

收集用户的回答后，您立即将答案设置回正确的答案:(注释所有三个提示的第二行）

 var a = +prompt("How many trunks does an elephant have?");
 //a = 1;

接下来，您的初始比较只会检查是否存在值，而不是它们是否正确

if (a,b,c) {

更改为：

if (a===1 && b===2 && c===9) {

所以你要根据正确答案检查每一个。 '==='运算符检查相等和变量类型。

完整代码：

var first = prompt("It is a great time outside, isn't it? (yes / no)");
//first = "yes";

if (first.toLowerCase().startsWith("y")) {
    alert("I do agree with you, cool! Now let's see if you can complete next task");
} else {
    alert("Sorry but you are wrong");
}

var a = +prompt("How many trunks does an elephant have?");
//a = 1;
var b = +prompt("How many legs has a human body?");
//b = 2;
var c = +prompt("How many planets are there in the Solar system?");
//c = 9;

if (a===1 && b===2 && c===9) {
    alert("Perfect! You've answered 3 questions correct"); 
} else if (a !== 1 && b !== 2 && c !== 9) {
    alert("Sorry, you did not answer any question correct");
} else if (a == 1 && b !== 2 && c !== 9 || a !== 1 && b == 2 && c !== 9 || a !== 1 && b !== 2 && c == 9) {
    alert("Bad! you gave only 1 correct answer");
} else if (a == 1 && b == 2 && c !== 9 || a !== 1 && b == 2 && c == 9 || a == 1 && b !== 2 && c == 9) {
    alert("Not bad! You've answered 2 questions correct");
}

我想向用户显示他回答了多少正确的问题。但它总是用3个正确的吻合器显示第一个警报

3 个答案: