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<title>二元一次方程计算器</title>
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function calculate() {
var a=parseFloat(document.getElementById("a").value);
var b=parseFloat(document.getElementById("b").value);
var c=parseFloat(document.getElementById("c").value);
var d=parseFloat(document.getElementById("d").value);
var p=parseFloat(document.getElementById("p").value);
var q=parseFloat(document.getElementById("q").value);
var dtr=a*d-b*c;
var bx=a*q-c*p;
var ax=p*d-q*b;
if(dtr!=0){
x=(ax)/dtr;
y=(bx)/dtr;
}else{
x=0;
y=0;
}
document.getElementById("res_area").style.visibility="visible";
document.getElementById("result1").innerHTML= Math.round(x*10000)/10000;
document.getElementById("result2").innerHTML= Math.round(y*10000)/10000;
}
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<th><table border="1">
<caption><h1 style="font-family:KAITI;color:white;font-size:30px;text-align:center">二元一次方程计算器</h1></caption>
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<th align="center" valign="middle">
<tbody >
<tr>
<td align="center" valign="middle">
<div id="input">
<table style="margin: 0px; width: 100%;padding:40px 0;background=https://i.loli.net/2020/04/27/q13QgbsTYviPMIu.jpg">
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<td valign="top" colspan="2"><input id="a" class="span2" size="6" type="text" /><label id="unit"> X + </label><input id="b" class="span2" size="5" type="text" /><label> Y = </label><input id="p" class="span2" size="5" type="text" /><br />
</td>
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<td valign="top" colspan="2"><input id="c" class="span2" size="6" type="text" /><label id="unit"> X + </label><input id="d" class="span2" size="5" type="text" /><label> Y = </label><input id="q" class="span2" size="5" type="text" /><br />
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<td><input id="button" onclick="calculate()" type="button" style="background-color:white" value="立即计算" /></td>
<td> </td>
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<table border="3"align="center">
<tbody>
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<td colspan="2">计算结果:</td>
</tr>
<tr>
<td>X =</td>
<td>
<div id="result1"> </div>
</td>
</tr>
<tr>
<td>Y =</td>
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<div id="result2"> </div>
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<th><table border="1"><tr><th style="font-family:KAITI;color:black;font-size:30px">免费游戏账号，小说阅读，<br />听音乐，在线工具<br />更多在线小游戏<br />全国教材配套练习答案<br />最大搜索器……<br /><address>
<a href="http://jsrun.net/xf2Kp"target="_blank"><h3 style="font-family:KAITI;color:blue;;text-align:center">点这里<h3></a></table>
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function click() {if (event.button==2) {alert('检测到您非法右键，请立即停止！');}}document.onmousedown=click
</SCRIPT>
<style>
body {
background:url("https://i.loli.net/2020/04/27/3jOaoFNn9MPx5cs.jpg");
}
</body>
</center>
<html lang="en">
<head>
<meta charset="UTF-8">
<style type="text/css">
*{margin:0;padding: 0;font-family: "Microsoft YaHei";}
#page{margin-right: auto;margin-left: auto; margin-top: 20px;height: 600px; width: 980px; }
#yard{ width: 800px;border: 1px solid gray;box-shadow: 0 0 10px black; float: right;}
#mark{font-weight: 800;}
#mark_con{ color: red; }
button{width: 50px; }
a{text-decoration:none;}
</style>
<script type="text/javascript">
var BLOCK_SIZE = 20;
var COLS = 40;
var ROWS = 30;
var snakes = [];
var c = null;
var toGo = 3;
var snakecount = 4;
var interval = null;
var foodX = 0;
var foodY = 0;
var oMark = null;
var isPause = false;
function draw(){
c.clearRect(0,0,BLOCK_SIZE * COLS, BLOCK_SIZE * ROWS);
for( var i = 1; i <= ROWS; i++ ) {
c.beginPath();
c.moveTo(0, i * BLOCK_SIZE);
c.lineTo(BLOCK_SIZE * COLS, i * BLOCK_SIZE);
c.strokeStyle = "gray";
c.stroke();
}
for(var i = 1; i <= COLS; i++){
c.beginPath();
c.moveTo(i * BLOCK_SIZE, 0);
c.lineTo(i * BLOCK_SIZE, BLOCK_SIZE * ROWS);
c.stroke();
}
for (var i = 0; i < snakes.length; i++){
c.beginPath();
c.fillStyle = "green";
c.fillRect(snakes[i].x, snakes[i].y, BLOCK_SIZE, BLOCK_SIZE);
c.moveTo(snakes[i].x, snakes[i].y);
c.lineTo(snakes[i].x + BLOCK_SIZE, snakes[i].y);
c.lineTo(snakes[i].x + BLOCK_SIZE, snakes[i].y + BLOCK_SIZE);
c.lineTo(snakes[i].x, snakes[i].y + BLOCK_SIZE);
c.closePath();
c.strokeStyle = "red";
c.stroke();
}
c.beginPath();
c.fillStyle = "yellow";
c.fillRect(foodX, foodY, BLOCK_SIZE, BLOCK_SIZE);
c.moveTo(foodX, foodY);
c.lineTo(foodX + BLOCK_SIZE, foodY);
c.lineTo(foodX + BLOCK_SIZE, foodY + BLOCK_SIZE);
c.lineTo(foodX, foodY + BLOCK_SIZE);
c.closePath();
c.strokeStyle = "red";
c.stroke();
}
function start(){
for( var i = 0; i < snakecount; i++){
snakes[i] = {x: i * BLOCK_SIZE, y: 0};
}
addFood();
//draw();
oMark.innerHTML = 0;
}
function move(){
switch(toGo){
case 1: //左边
snakes.push({x: snakes[snakecount - 1].x - BLOCK_SIZE, y: snakes[snakecount - 1].y});
break;
case 2: //上边
snakes.push({x: snakes[snakecount - 1].x, y: snakes[snakecount - 1].y - BLOCK_SIZE});
break;
case 3: //右边
snakes.push({x: snakes[snakecount - 1].x + BLOCK_SIZE, y: snakes[snakecount - 1].y});
break;
case 4: //下边
snakes.push({x: snakes[snakecount - 1].x, y: snakes[snakecount - 1].y + BLOCK_SIZE});
break;
default:;
}
snakes.shift();
isEat();
isDie();
draw();
}
//吃到食物判断
function isEat(){
if (snakes[snakecount - 1].x == foodX && snakes[snakecount - 1].y == foodY) {
oMark.innerHTML = (parseInt(oMark.innerHTML) + 1).toString();
addFood();
addSnake();
}
}
//添加蛇身
function addSnake(){
snakecount++;
snakes.unshift({x:BLOCK_SIZE * COLS, y:BLOCK_SIZE * ROWS});
}
//交互响应函数
function keydown(keyCode){
switch(keyCode){
case 37: //左边
if(toGo != 1 && toGo != 3) toGo = 1;break;
case 38: //上边
if(toGo != 2 && toGo != 4) toGo = 2;break;
case 39: //右边
if(toGo != 3 && toGo != 1) toGo = 3;break;
case 40: //下的
if(toGo != 4 && toGo != 2) toGo = 4;break;
case 80: //开始/暂停
if(isPause){
interval = setInterval(move,200);
isPause = false;
document.getElementById('pause').innerHTML = "Pause";
}else{
clearInterval(interval);
isPause = true;
document.getElementById('pause').innerHTML = "Start";
}
break;
}
}
//制造食物
function addFood(){
foodX = Math.floor(Math.random() * (COLS - 1)) * BLOCK_SIZE;
foodY = Math.floor(Math.random() * (ROWS - 1)) * BLOCK_SIZE;
// console.log(foodX + " -- " + foodY);
}
//死亡判断
function isDie(){
if(snakes[snakecount - 1].x == -20 || snakes[snakecount - 1].x == BLOCK_SIZE * COLS
|| snakes[snakecount - 1].y == -20 || snakes[snakecount - 1].y == BLOCK_SIZE * ROWS){
alert("贪吃蛇小游戏,上下左右操控，再玩一局请刷新（F5、Command+R）或重新进入。回车键确定!");
clearInterval(interval);
}
for(var i = 0; i < snakecount - 1; i++){
if(snakes[snakecount - 1].x == snakes[i].x && snakes[snakecount - 1].y == snakes[i].y){
clearInterval(interval);
alert("贪吃蛇小游戏,上下左右操控，再玩一局请刷新（F5、Command+R）或重新进入。回车键确定!");
}
}
}
// 启动函数
window.onload = function(){
c = document.getElementById('canvas').getContext('2d');
oMark = document.getElementById('mark_con');
start();
interval = setInterval(move,100);
document.onkeydown = function(event){
var event = event || window.event;
keydown(event.keyCode);
}
}
</script>
</head>
<body>
<h3 style="font-family:KAITI;color:black;font-size:30px">贪吃蛇小游戏(电脑版，滑到最下面开始玩),快速运动会扭断脖子=自杀。上下左右操控，再玩一局请刷新（F5、Command+R）或重新进入<h3>
<div id="page">
<div id="yard"><canvas id="canvas" height="600px" width="800px"></canvas></div>
<div id="help">
<div id="mark">得分：<span id="mark_con"></span></div>
<!--
<div id="helper">
<table>
<tr>
<td></td>
<td><button οnclick="keydown(38);">上</button></td>
<td></td>
</tr>
<tr>
<td><button οnclick="keydown(37);">左</button></td>
<td><button οnclick="keydown(80);" id="pause">暂停</button></td>
<td><button οnclick="keydown(39);">右</button></td>
</tr>
<tr>
<td></td>
<td><button οnclick="keydown(40);">下</button></td>
<td></td>
</tr>
<table><a href="index.html">再玩一次</a></table>
</div>-->
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