我正在构建一个答题器的一部分，它允许您创建一个包含价格、价格增量和每秒金钱的新对象。我制作了一个原型(prototype)，其中包含一个 If 语句，用于检查您是否有足够的资金进行购买。 If 语句内部是一个 while 循环，可确保计数器在您达到最大金额时停止。
问题是我正在使用一种名为 addMps(每秒金钱) 的方法，它告诉每秒添加多少钱。在 If 语句的第一部分中，addMps 方法工作正常，但在第二部分中它返回的不是数字。仅使用数字或变量即可正常工作。有什么建议吗？
这是我的代码
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.11.1/jquery.min.js"></script>
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>clicker testing</title>
<link href="/style.css" rel="stylesheet" type="text/css" media="all">
<meta name="viewport" content="width=device-width, initial-scale=1">
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.12.0/jquery.min.js"></script>
<link rel="stylesheet" href="path/to/font-awesome/css/font-awesome.min.css">
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.11.3/jquery.min.js"></script>
<link rel="stylesheet" href="path/to/font-awesome/css/font-awesome.min.css">
<script>
/* $(".test").click(function() {
if(amount >= testPrice) {
memory -= testPrice;
testPrice += 25;
memoryPerSec+= 10;
$(".logo").text("logo plus 10mps: " + logoPrice + "memory");
memoryPerSecUpdate();
function logo() {
if(memory < maxMemory) {
memory+= 10;
counterUpdate();
setTimeout(logo, 1000);
}
}
setTimeout(logo, 0);
}
else {
alert("not enough memory");
}
});*/
var money = 200;
var maxMoney = 300;
var mps = 0;
function updateCounters() {
$(".money").text("money: " + money);
$(".mps").text("money per sec: " + mps);
$(".max").text("max money: " + maxMoney);
}
function clicker(addPrice, addPriceIncrement, addMps) {
this.addPrice = addPrice;
this.addPriceIncrement = addPriceIncrement;
this.addMps = addMps;
}
var stuff = new clicker(100, 25, 10);
clicker.prototype.buy = function() {
if(money >= this.addPrice) {
money -= this.addPrice;
this.addPrice += this.addPriceIncrement;
mps += this.addMps;
updateCounters();
function max() {
if(money < maxMoney) {
money += this.addMps;
updateCounters();
setTimeout(max, 1000);
}
}
setTimeout(max, 0);
}
else {
alert("not enough memory");
}
};
$(document).ready(function() {
updateCounters();
$(".stuff").click(function() {
stuff.buy();
});
});
</script>
</head>
<body style="text-decoration: underline; font-family: verdana;">
<div class="stuff">stuff</div>
<div class="money"></div>
<div class="mps"></div>
<div class="max"></div>
<h4>go ahead an click stuff then change this.addMps to a number in the max() function and it works:<br>
p.s its on line 56
</h4>
</body>
</html>最佳答案
问题是 this 与函数内的东西不同，它被重新定义，所以你必须将它放入另一个变量中，就像这样 var self = this;。见下文:
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.11.1/jquery.min.js"></script>
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>clicker testing</title>
<link href="/style.css" rel="stylesheet" type="text/css" media="all">
<meta name="viewport" content="width=device-width, initial-scale=1">
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.12.0/jquery.min.js"></script>
<link rel="stylesheet" href="path/to/font-awesome/css/font-awesome.min.css">
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.11.3/jquery.min.js"></script>
<link rel="stylesheet" href="path/to/font-awesome/css/font-awesome.min.css">
<script>
/* $(".test").click(function() {
if(amount >= testPrice) {
memory -= testPrice;
testPrice += 25;
memoryPerSec+= 10;
$(".logo").text("logo plus 10mps: " + logoPrice + "memory");
memoryPerSecUpdate();
function logo() {
if(memory < maxMemory) {
memory+= 10;
counterUpdate();
setTimeout(logo, 1000);
}
}
setTimeout(logo, 0);
}
else {
alert("not enough memory");
}
});*/
var money = 200;
var maxMoney = 300;
var mps = 0;
function updateCounters() {
$(".money").text("money: " + money);
$(".mps").text("money per sec: " + mps);
$(".max").text("max money: " + maxMoney);
}
function clicker(addPrice, addPriceIncrement, addMps) {
this.addPrice = addPrice;
this.addPriceIncrement = addPriceIncrement;
this.addMps = addMps;
}
var stuff = new clicker(100, 25, 10);
clicker.prototype.buy = function() {
if(money >= this.addPrice) {
money -= this.addPrice;
this.addPrice += this.addPriceIncrement;
mps += this.addMps;
updateCounters();
var self = this;
function max() {
if(money < maxMoney) {
money += self.addMps;
updateCounters();
setTimeout(max, 1000);
}
}
setTimeout(max, 0);
}
else {
alert("not enough memory");
}
};
$(document).ready(function() {
updateCounters();
$(".stuff").click(function() {
stuff.buy();
});
});
</script>
</head>
<body style="text-decoration: underline; font-family: verdana;">
<div class="stuff">stuff</div>
<div class="money"></div>
<div class="mps"></div>
<div class="max"></div>
<h4>go ahead an click stuff then change this.addMps to a number in the max() function and it works:<br>
p.s its on line 56
</h4>
</body>
</html>关于javascript - JS定义的方法仅在语句的一部分等于NaN，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/36805205/