简单的计时器 (倒计时)--html Demo
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内容图文
<!
DOCTYPE html
>
<
html
>
<
head
>
<
meta
http-equiv
="Content-type"
content
="text/html; charset=utf-8"
/>
<
title
>HTML5 Timer</title><script type="text/javascript" src="js/jquery-1.7.2.min.js"></script></head><body><div style="margin: 20px auto; text-align: center;"><div style="padding: 50px;"><input type="button" id="btnstart" value="start"/></div><canvas id="canvas" width="200" height="200" style="border: 1px solid #000;">Chrome,IE9,IE10,Firefox。</canvas><h2>Please Choose the correct answer:</h2><h3>1: 1+1=?</h3><input type="radio" name="answer" value="1"/>1
<input type="radio" name="answer" value="2"/>2
<input type="radio" name="answer" value="3"/>3
<input type="radio" name="answer" value="4"/>4<br /><input type="button" id="btnSubmit" value="submit"/><div style="padding: 50px;"><input type="button" id="btnStop" value="Stop"/></div></div><script type="text/javascript">
$(‘<audio id="auSound"><source src="sound/wrong_answer_buzzer.mp3" type="audio/mpeg"></audio><audio id="auCorrect"><source src="sound/correct_answer_bell_ring.mp3" type="audio/mpeg"></audio>‘).appendTo(‘body‘);
var canvas = document.getElementById(‘canvas‘);
var timerId;
var ctx = canvas.getContext(‘2d‘);
if (ctx) {
var frameRate =60;
function canvObject() {
this.x =0;
this.y =0;
this.rotation =0;
this.borderWidth =2;
this.borderColor =‘#000000‘;
this.fill =false;
this.fillColor =‘#ff0000‘;
this.update =function () {
if (!this.ctx) thrownew Error(‘not canvas‘);
var ctx =this.ctx
ctx.save();
ctx.lineWidth =this.borderWidth;
ctx.strokeStyle =this.borderColor;
ctx.fillStyle =this.fillColor;
ctx.translate(this.x, this.y);
if (this.rotation) ctx.rotate(this.rotation * Math.PI /180);
if (this.draw) this.draw(ctx);
if (this.fill) ctx.fill();
ctx.stroke();
ctx.restore();
}
};
function Line() { };
Line.prototype =new canvObject();
Line.prototype.fill =false;
Line.prototype.start = [0, 0];
Line.prototype.end = [5, 5];
Line.prototype.draw =function (ctx) {
ctx.beginPath();
ctx.moveTo.apply(ctx, this.start);
ctx.lineTo.apply(ctx, this.end);
ctx.closePath();
};
function Circle() { };
Circle.prototype =new canvObject();
Circle.prototype.draw =function (ctx) {
ctx.beginPath();
ctx.arc(0, 0, this.radius, 0, 2* Math.PI, true);
ctx.closePath();
};
var circle =new Circle();
circle.ctx = ctx;
circle.x =100;
circle.y =100;
circle.radius =90;
circle.fill =true;
circle.borderWidth =6;
circle.fillColor =‘#ffffff‘;
var seconds =new Line();
seconds.ctx = ctx;
seconds.x =100;
seconds.y =100;
seconds.borderColor ="#ff0000";
seconds.borderWidth =4;
seconds.rotation =0;
seconds.start = [0, 20];
seconds.end = [0, -80];
var center =new Circle();
center.ctx = ctx;
center.x =100;
center.y =100;
center.radius =5;
center.fill =true;
center.borderColor =‘orange‘;
for (var i =0, ls = [], cache; i <12; i++) {
cache = ls[i] =new Line();
cache.ctx = ctx;
cache.x =100;
cache.y =100;
cache.borderColor ="orange";
cache.borderWidth =2;
cache.rotation = i *36;
cache.start = [0, -70];
cache.end = [0, -80];
}
//clear canvas ctx.clearRect(0, 0, 200, 200);
ctx.fillRect(0, 0, 200, 200);
circle.update();
for (var i =0; cache = ls[i++];) cache.update();
seconds.update();
center.update();
} else {
alert(‘error‘);
}
$("#btnstart").live("click", function () {
var number =0;
$("input[name=answer]").attr("disabled", false);
clearInterval(timerId);
timerId = setInterval(function () {
if (number ==10) {
clearInterval(timerId);
$(‘#auSound‘)[0].play();
$("input[name=answer]").attr("disabled", true);
}
ctx.clearRect(0, 0, 200, 200);
ctx.fillRect(0, 0, 200, 200);
circle.update();
for (var i =0; cache = ls[i++];) cache.update();
seconds.rotation = (number++) *6*6;
seconds.update();
center.update();
}, 1000);
})
$("#btnStop").live("click", function () {
clearInterval(timerId);
});
$("#btnSubmit").live("click", function () {
clearInterval(timerId);
if ($(":radio:checked").val() =="2") {
$(‘#auCorrect‘)[0].play();
alert("correct");
} else {
$(‘#auSound‘)[0].play();
alert("wrong");
}
});
</script></body></html>
这个计时器如果超过十秒将播放错误声音，如果回答正确，将播放正确声音
这是效果图：
原文：http://www.cnblogs.com/hanliping/p/4156018.html
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