真正的网页抽奖-JavaScript HTML5代码

2024-09-05 12:18:52

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HTML5抽奖代码，真正的网页抽奖程序，写出了最核心的抽奖功能，用的朋友可再美化一上。右上角的文字是按钮按钮，当转盘要停下的时候，是慢慢停止，速度由快到慢，最后停止，完全HTML5效果。

<!DOCTYPE html><html><head><meta charset="UTF-8"><title>圆盘抽奖</title><style>*.{margin:0;padding:0;}#elm1{height:40px;background-color:#a00;}#elm2{height:50px;background-color:#0a0;}#wrap{position:relative;height:400px;}#bg{position:absolute;left:0;top:0;}#cell{position:absolute;left:0;top:0;}#control{position:absolute;left:430px;top:30px;}</style></head><body><div id='elm1'></div><div id='wrap'><canvas id='bg'></canvas><canvas id='cell'></canvas><div id='control'><div id='start'>start</div><div id='end'>end</div><div id='show'>show</div></div></div><div id='elm2'></div><script type="text/javascript">var field = [[0,30],[30,60],[60,90],[90,120],[120,150],[150,180],[180,210],[210,240],[240,270],[270,300],[300,330],[330,360]]    ,fillStyle = ['#a00','#0a0','#00a','aa0','#a16','#0aa','#a5a','f31','#784','#a43','#34a','#786'] 	,width = 400	,height = 400	,c_x = 200	,c_y =200	,radius = 200	,dom_bg = document.getElementById('bg')	,dom_cell = document.getElementById('cell')	,index =0	,timer = null	,stop = false	,running = false	,speed = 300	,flag = false	,stepall	,stepfast = 7	,stepslow	,stepping =0	,selected	,pos;function setup(){	drawBg();}function drawBg(){	var deg = Math.PI/180;	var tmp_1 = 0;	var tmp_2 = 30;	dom_bg.height = height;	dom_bg.width = width;	var ctx=dom_bg.getContext('2d');	for(var i=0;i<12;i++){		ctx.beginPath();		ctx.fillStyle = fillStyle[i];		ctx.moveTo(c_x,c_y);		ctx.arc(c_x,c_y,radius,deg*tmp_1,deg*tmp_2,false);		ctx.fill();		ctx.fillStyle = '#000';		ctx.fillText(tmp_1,200+Math.cos(deg*(tmp_1+15))*130,200+Math.sin(deg*(tmp_1+15))*130);		tmp_1 +=30;		tmp_2 +=30;	}}function drawBgText(){	}function rotate(){	if(!flag && stepping>7){		clearTimer();		speed = 100;		timer = setInterval(rotate,speed);	}	if(flag && stepping > stepslow && stepping <stepall){		clearTimer();		speed = 300;		timer = setInterval(rotate,speed);	}	if(index ==12){		index = 0;	}	if(flag && stepping == stepall){		clearTimer();		happy();	}	drawCell();	index++;	stepping++;}function drawCell(){	var deg = Math.PI/180;	var tmp_1 = field[index][0];	var tmp_2 = field[index][1];	dom_cell.height=height;	dom_cell.width =width;	var ctx=dom_cell.getContext('2d');	ctx.beginPath();	ctx.fillStyle = '#eee';	ctx.moveTo(c_x,c_y);	ctx.arc(c_x,c_y,radius,deg*tmp_1,deg*tmp_2,false);	ctx.fill();}function createStop(){	selected = Math.floor(Math.random() * 11);         //从0-11个数字中选   想zb在这控制一下。	var circle = Math.floor(Math.random()*3) + 2;	var c_step = circle *12;	var   actualIndex = stepping%12;	stepall =  selected - actualIndex + c_step;	flag = true;	stepslow = stepall - 7;	stepping = 0;}function happy(){	document.getElementById("show").innerText = selected + '选上了';}function startClick(){	if(running){		return;	}	running= true;	timer = setInterval(rotate,speed);}function endClick(){	if(stop){		return;	}	stop = true;	clearTimer();	createStop();	timer = setInterval(rotate,speed);}function clearTimer(){	clearInterval(timer);	timer = null;}setup();document.getElementById('start').addEventListener('click',startClick,false);document.getElementById('end').addEventListener('click',endClick,false);</script></body></html>

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