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我正在创建一个互动游戏，并且对编程非常新颖。我想知道如何增加一个变量然后把它放到一个警告框中。我想找到foodCaught和food的计算方法，并在游戏结束时将它显示在一个警戒框中。另外我该如何做到这一点，所以它是在一个计时器上，并在这个计时器的结束时，与foodCaught和foodWasted警报框出现？如何在警报中创建计算？
$(document).ready(function(){
var cnv = $("#myCanvas")[0];
var ctx = cnv.getContext("2d");
var catcherX = ctx.canvas.width/2;
var catcherY = ctx.canvas.height - 100; // set the initial location of the catcher's y position
var numFoods = 5;
var catcherSpeed = 30;
var foodCaught = 0;
var foodWasted = 0;
function Food(){ // the name of the constructor usually begins with a captial letter
this.radius = 30;
this.x = Math.floor(Math.random()*ctx.canvas.width);
this.y = 0 - this.radius;
this.speed = 1+ Math.floor(Math.random()*5);
var imageToUse = new Image();
this.width = 50; // default values
this.height = 50; // default values
var randomNum = Math.floor(Math.random()*2); // create a random number to choose the image
if(randomNum == 0){
imageToUse.src = "corn.png";
this.width = 27; // width of corn.png
this.height = 100; // height of corn.png
} else if(randomNum == 1){
imageToUse.src = "straw.png"
this.width = 83; // width of straw.png
this.height = 100; // height of straw.png
}
this.moveFood = function(){
if(this.y > ctx.canvas.height){
this.x = Math.floor(Math.random()*ctx.canvas.width);
this.y = 0;
footWasted += 1;
}
this.y += this.speed; // add speed to location
}
this.drawFood = function() {
ctx.drawImage(imageToUse, this.x, this.y);
}
this.intersectFood = function(targetX, targetY, targetR) {
if(this.x + this.width > targetX && this.x < targetX + targetR && this.y + this.height > targetY && this.y < targetY + targetR){
foodCaught += 1;
return true;
}
/*
var distanceX = this.x - targetX;
var distanceY = this.y - targetY;
var distance = Math.sqrt(distanceX * distanceX + distanceY * distanceY);
if(distance < targetR + this.radius){
return true;
}
*/
}
}
// create an Array of Foods
var FoodArray = new Array();
for(var i=0; i<numFoods; i++) {
FoodArray[i] = new Food();
}
// get mouse Postion
$(document).keydown(function(e){ // attach the event to the entire document
switch(e.keyCode){
case 37: // left
catcherX-= catcherSpeed;
break;
case 39: // right
catcherX+= catcherSpeed;
break;
}
});
var interval = setInterval(gameLoop,10); // call draw every 10 milliseconds
var counter = 0;
function gameLoop(){
ctx.clearRect(0,0, ctx.canvas.width, ctx.canvas.height); //clears previous circles
for(var i=0; i < FoodArray.length; i++) {
FoodArray[i].moveFood();
FoodArray[i].drawFood();
if(FoodArray[i].intersectFood(catcherX, catcherY, 15)){
FoodArray.splice(i,1);
console.log(i);
}
}
// draw catcher
ctx.beginPath();
ctx.fillStyle="#119933";
ctx.arc(catcherX,catcherY,15,0,Math.PI*2,true);
ctx.closePath();
ctx.fill();
使用在javascript取向而不的基本变量存储和警报知识对象A新手。这很讽刺。 – 2014-12-07 05:49:19
*“我正在创建”* - 我发现不可能相信您编写了上述代码，但需要帮助增加一个变量。显示的代码已经有很多增量变量的例子。它也有一个计时器，但为了提醒你需要'setTimeout'而不是'setInterval'。 – nnnnnn 2014-12-07 05:54:20
请在下面找到我的答案，并将其标记为接受，如果它解决您的问题。 – 2014-12-07 12:10:51