未捕获的ReferenceError:赋值While循环中无效的左手边错误

Uncaught ReferenceError: Invalid left-hand side in assignment While loop error

本文关键字：无效 循环 错误 While ReferenceError 赋值      更新时间：2023-09-26

当我尝试运行此代码时，我在控制台中得到一个错误，但我不知道为什么!它是这样说的:未捕获的ReferenceError:赋值的左边无效，它指向第31行

也就是这一行:if (colors.indexOf(String(guess_input))=-1){

基本上我要做的是检查输入的字符串是否是我的预定义数组的一部分，你可以在下面的代码中看到。游戏的终点是一个猜谜游戏，用户必须猜出一种颜色。

<!DOCTYPE >
<html>
<head>
<title>Welcome To The JS Guessing Game</title>
</head>
<body onload="do_game()">
<script> 
//Initialize the variables that will be needed.
var target;
var target_index;
var guess_input;
var guesses=0;
var finished=false;
var guesses=0;
var colors = ["blue", "cyan", "gold", "green", "magenta", "orange", "red", "white", "yellow"];
function do_game(){
    var random_number = (Math.random()*colors.length);
    var random_number=Math.floor(random_number);
    target=colors[random_number];
    alert(target);
    while (!finished){
        guess_input=prompt("I am thinking of a color in the list below. Can you guess which color?"+"'n'n"+ colors.join() );
        guesses++;
        finished = check_guess();  //so finished in the function has to return true for this condition to be met.
    }
}
function check_guess(){
    if (colors.indexOf(String(guess_input))=-1){
        alert("I'm sorry, I do not recognize that color! Try again.");
        return true;
    }
    else if (guess_input > target){
        alert("Your guess is alphabetically higher than the correct answer.");
        return true;
    }
    else if (guess_input < target){
        alert("Your guess is alphabetically lower than the correct answer. ");
        return true;
    }
    else {
        myBody=document.getElementsByTagName("body")[0];
        myBody.style.background=target;
        alert("You are right! You took "+guesses+" guesses!");
        return false;
    }
}
</script>
</body>
</html>

结果是第一个警告窗口显示告诉我颜色，然后提示，但在那之后，不管输入，事情就停止了:(如果你能帮忙，我将不胜感激。

欢呼,大卫

变化

if (colors.indexOf(String(guess_input))=-1){


f (colors.indexOf(String(guess_input))==-1){

你的脚本基本上试图将值-1赋值给不是变量的东西

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