/* F12贪吃蛇小游戏
*/
(function () {
function play(simsun,speed){
var maxLog = 200;//maxLog个就清除一次，以免浏览器卡死
var logNum = 0;
var speed = speed?speed:3;
if(simsun===false){
var cubeletter = '回';
}else{
cubeletter = '〓';
}
var time = 1000/speed;
var width=32,height=24;//内部
var size = width*height;
var applePoint = {
x:null,
y:null,
set:function(){
do{
var x = parseInt(Math.random()*width);
var y = parseInt(Math.random()*width);
}while(checkBound(x,y));
this.x = x;
this.y = y;
}
}
var snake = [];
snake.push({
x:parseInt(width/2),
y:parseInt(height/2)
});
var direction = 'top';
function snakeGo(){
var head = snake[0];
var newHead = {
x:head.x,
y:head.y
};
if(direction=='top'){
newHead.y--;
}else if(direction=='left'){
newHead.x--;
}else if(direction=='right'){
newHead.x++;
}else{
newHead.y++;
}
if(!checkBound(newHead.x,newHead.y)){
snake.unshift(newHead);
if(newHead.x==applePoint.x&&newHead.y==applePoint.y){
applePoint.set();
}else{
snake.pop();
}
paint();
setTimeout(snakeGo,time);
}else{
console.log('%cgame over,吃了'+(snake.length-1)+'个苹果。','color:red;font-weight:bold;');
window.removeEventListener('keydown',keyDown,false);
}
}
function checkBound(x,y){
if(x<0||x>=width||y<0||y>=height){
return true;
}
for(var i=0;i<snake.length;i++){
if(snake[i].x==x&&snake[i].y==y){
return true;
}
}
return false;
}
function paint(){
str = '\n';
for(var i=0;i<height+2;i++){
for(var j=0;j<width+2;j++){
var x = j-1;
var y = i-1;
if(x==applePoint.x&&y==applePoint.y){
str = str+'果';
}else if(checkBound(x,y)){
str = str+cubeletter;
}else{
str = str+ ' ';
}
}
str = str +'\n';
}
logNum++;
if(logNum%maxLog==0){
console.clear();
}
console.log(str);
}
var readyTime = 5;
(function(){
console.log(readyTime+'秒...');
if(readyTime){
readyTime--;
setTimeout(arguments.callee,1000);
}else{
applePoint.set();
snakeGo();
}
})();
var keyMap = {
38:'top',
39:'right',
40:'bottom',
37:'left'
}
function keyDown(e){
e.preventDefault();
var dir = keyMap[e.keyCode];
if(snake.length>1&&(dir=='top'&&(snake[0].y-snake[1].y==1)||
dir=='left'&&(snake[0].x-snake[1].x==1)||
dir=='right'&&(snake[0].x-snake[1].x==-1)||
dir=='bottom'&&(snake[0].y-snake[1].y==-1))){
return;
}else{
direction = dir;
}
}
window.addEventListener('keydown',keyDown,false);
}
window.console = window.console||{};
window.console.log = window.console.log||function(){};
console.log('玩一个游戏吧。\n先把控制台拉高点.\n接着输入play，按回车，\n%c然后用鼠标点击页面，让鼠标焦点移动到页面中。\n马上转移到键盘上用上下左右操作，别动鼠标！','color:red;font-weight:bold;');
Object.defineProperty(window, 'play', {
get: function() {
play()
}
})
})()
