为什么另一个 else if 语句运行 javascript

Question

所以我正在 JavaScript 开发贷款计算器。所以我一直运行关注这个问题，当用户输入一个高于 400 但低于 500 的数字时，它不会运行那个 if 语句，而是运行另一个 else if如果数字高于 500 且低于 640 的语句。我正在谈论的以下代码在下面。任何帮助将不胜感激。

else if (500 < getCredit < 640){
        alert("This is it");
        score += 6
        console.log("The score is " + score);
    }

    else if (400 < getCredit < 500) {
        score += 0 // The else if statement above is executed and not this  one whenever conditions are met
    }

下面是剩下的代码 js代码

    function myFunction() {

    score = 0;

    var getCredit = parseInt(document.getElementById("credit").value);
    if(getCredit > 640){
        score += 12
        console.log("The score is " + score);// This is working the right way
    }

    else if (500 < getCredit < 640){
        alert("I learned something at Mathnasium");
        score += 6
        console.log("The score is " + score);
    }

    else if (400 < getCredit < 500) {
        score += 0
    }
}

Answer 1

function myFunction() {

    score = 0;

    var getCredit = parseInt(document.getElementById("credit").value);
    if(getCredit > 640){
        score += 12
        console.log("The score is " + score);// This is working the right way
    }

    else if (getCredit > 500 && getCredit <= 640){
        alert("I learned something at Mathnasium");
        score += 6
        console.log("The score is " + score);
    }

    else if (getCredit > 400 && getCredit <= 500) {
        score += 0
    }
}

Answer 2

if (getCredit >= 640) {
    // credit is 640 or more
}
else if (getCredit >= 500) {
    // credit is 500 or more, and less than 640 because of the "if (getCredit >= 640)" above
}
else if (getCredit >= 400) {
    // credit is 400 or more, and less than 500
}

else if (500 < getCredit < 640){ 从左到右计算为

else if ( (500 < getCredit) < 640) {

的计算结果为 (true < 640) 或 (false < 640)，但它们的结果均为 true：

console.log(500 < 1 < 640)   // true   (false < 640)

console.log(true  < 640)     // true

console.log(false < 640)     // true

console.log(true  == 1)      // true 

console.log(false == 0)      // true

为什么另一个 else if 语句运行 javascript

Why is another else if statment running javascript

javascript

if-statement

execution

为什么另一个 else if 语句 运行 javascript

Why is another else if statment running javascript

javascript

if-statement

execution

为什么另一个 else if 语句运行 javascript