“得到回报”;[对象]楠“Javascript

“得到回报”;[对象]楠“Javascript,javascript,canvas,nan,parseint,Javascript,Canvas,Nan,Parseint,正如标题所说,当我执行代码时,在控制台中返回“[object]NaN”(在控制台中带有引号) 由于我总是不太确定要发送什么代码,因为它们可能涉及其他因素,所以我将把我所有的代码都发布进来 Main.Js var ctx = document.getElementById("canvas").getContext("2d"); ctx.canvas.width = window.innerWidth; ctx.canvas.height = window.innerHeight; var zom

正如标题所说,当我执行代码时,在控制台中返回
“[object]NaN”
(在控制台中带有引号)

由于我总是不太确定要发送什么代码,因为它们可能涉及其他因素,所以我将把我所有的代码都发布进来

Main.Js

var ctx = document.getElementById("canvas").getContext("2d");
ctx.canvas.width = window.innerWidth;
ctx.canvas.height = window.innerHeight;

var zombie1 = new Rectangle(300, 300, 20, 50);
var border = new Rectangle(0, 0, window.innerWidth, window.innerHeight);
var debugPlayer = new Rectangle(400, 400, 50, 50);

zombie1.ChangeColour("rgb(0, 0, 255)");
border.ChangeColour("rgb(150, 150, 150)");
border.ChangeThickness(300);
debugPlayer.ChangeColour("rgb(100, 100, 100)")


var playerup = "false"
var playerdown = "false"
var playerleft = "false"
var playerright = "false"

var update = function(){

    if (playerup == "true"){
        debugPlayer.y = debugPlayer.y - 1
    };
    if (playerdown == "true"){
        debugPlayer.y = debugPlayer.y + 1
    };
    if (playerleft == "true"){
        debugPlayer.x = debugPlayer.x - 1
    };
    if (playerright == "true"){
        debugPlayer.x = debugPlayer.x + 1
    };

    DoCollision(debugPlayer, zombie1);

    var processedZombiewidth = parseInt(zombie1.width, 10);
    console.log(debugPlayer.x, zombie1.x, debugPlayer + processedZombiewidth); // I am getting "400, 300, "[object Object] NaN" in console.

};
var makeScreen = function(){
    ctx.clearRect(0, 0, ctx.canvas.width, ctx.canvas.height);

    border.Draw(ctx, "true");
    debugPlayer.Draw(ctx, "false")
    zombie1.Draw(ctx, "false");
};

var DoCollision = function(rect1, rect2){
    if (rect1.x > rect2.x){
        if (rect1.x < rect2.x + rect2.width){
            console.log("fat")
        };      
    };
};

var updateFunc = function(){
    update();
    makeScreen();
};



setInterval(function(){updateFunc();}, 1);




$(document).keyup(function(objEvent){
        objEvent ? keycode = objEvent.keyCode : keycode = event.keyCode; 
        console.log(keycode);

        if (keycode == 87){ //W
            playerup = "false"
        };
        if (keycode == 65){ //A
            playerleft = "false"
        };
        if (keycode == 83){ //S
            playerdown = "false"
        };
        if (keycode == 68){ //D
            playerright = "false"
        };

});
$(document).keydown(function(objEvent){
        objEvent ? keycode = objEvent.keyCode : keycode = event.keyCode;
        console.log(keycode);
        if (keycode == 87){ //W
            playerup = "true"
        };
        if (keycode == 65){ //A
            playerleft = "true"
        };
        if (keycode == 83){ //S
            playerdown = "true"
        };
        if (keycode == 68){ //D
            playerright = "true"
        };
});

这里有两个错误:

1)
zombie1
没有属性
width
,只有
w
。使用
parseInt()
转换非数字值将产生
NaN

2) 您正在将数字(或者更确切地说是
NaN
)添加到对象
debugPlayer
。这在任何情况下都会产生
NaN

要修复此问题,请尝试将
w
添加到debugPlayer的
x

//var processedZombiewidth = parseInt(zombie1.width, 10);  not needed
console.log(debugPlayer.x, zombie1.x, debugPlayer.x + zombie1.w);

你能贴一张小提琴来说明错误吗?仅供参考,javascript实际上有布尔值,你不必使用字符串
debugPlayer
是一个对象,
processedZombiewidth
似乎是
NaN
。而
({}+NaN)
产生
“[object object]NaN”
对于这个问题,如果返回,跟踪一下,你有
debugPlayer+processedZombiewidth
,如果你看
debugPlayer
它显然是一个对象,然后你有
processedZombiewidth
,它应该是一个数字,你不能把一个数字和一个对象加在一起,期望得到一些有意义的东西。然后你有了
parseInt(zombie1.width,10)
,当然
zombie1
没有在代码中的任何地方定义,所以你会发现这是错误的,因为我使用的是objects x变量,它是一个int,processedzombiewidth也是一个int。。。所以我不知道为什么我会得到我现在得到的谢谢!我希望这是一个合理的问题,我没有浪费你的时间,但你帮了我很多。谢谢
//var processedZombiewidth = parseInt(zombie1.width, 10);  not needed
console.log(debugPlayer.x, zombie1.x, debugPlayer.x + zombie1.w);