学习css3ing，正在学习transfomr，突发奇想用此做个小时钟，开始吧：

准备前期工作，把时钟的表盘，时分秒针，实时时间标签 的大概样子做好，效果如图：

html代码如下：

代码如下:

css 代码如下：

代码如下:

2. 初始化默认时间，和表盘刻度 ，效果如下：

更改后的css代码：

代码如下:

初始化 js代码：

代码如下:

window.onload = function () {

initClock();

}

var timer = null;

function $(id) {

return document.getElementById(id)

}

function CreateKeDu(pElement, className, deg, translateWidth) {

var Pointer = document.createElement("div");

Pointer.className = className

Pointer.style.transform = "rotate(" + deg + "deg) translate(" + translateWidth + "px)";

pElement.appendChild(Pointer);

}

function initClock() {

var main = $("biaopan");

var timeLabel = $("timeLabel");

var hour = $("hour");

var minute = $("minute");

var second = $("second");

var now = new Date();

var nowHour = now.getHours();

var nowMinute = now.getMinutes();

var nowSecond = now.getSeconds();

//初始化timeLabel

timeLabel.innerHTML = nowHour + ":" + nowMinute + ":" + nowSecond;

//初始化表盘

for (var index = 0; index < 4; index++) {

CreateKeDu(main, "hourPointer", index * 90, 138);

}

for (var index = 0; index < 12; index++) {

CreateKeDu(main, "minuterPointer",index*30, 140);

}

for (var index = 0; index < 60; index++) {

CreateKeDu(main, "secondPointer", index * 6, 142);

}

//初始化时分秒针

second.style.transform = "rotate(" + (nowSecond * 6 - 90) + "deg)";

minute.style.transform = "rotate(" + (nowMinute * 6 + 1 / 10 * nowSecond - 90) + "deg)";

hour.style.transform = "rotate(" + (nowHour * 30 + 1 / 2 * nowMinute + 1 / 120 * nowSecond - 90) + "deg)";

}

3.添加定时器：

js代码如下：

代码如下:

//定时器

function startMove() {

clearInterval(timer);

timer = setInterval(function () {

var now = new Date();

var nowSecond = now.getSeconds();

var nowMinute = now.getMinutes();

var nowHour = now.getHours();

second.style.transform = "rotate(" + (nowSecond * 6 - 90) + "deg)";

minute.style.transform = "rotate(" + (nowMinute * 6 + 1 / 10 * nowSecond - 90) + "deg)";

hour.style.transform = "rotate(" + (nowHour * 30 + 1 / 2 * nowMinute + 1 / 120 * nowSecond - 90) + "deg)";

timeLabel.innerHTML = nowHour + ":" + nowMinute + ":" + nowSecond;

}, 1000);

}

4.使用OOP方式更改：

修改后的js代码如下：

代码如下:

function Clock() {

//定义属性

this.main = this.$("biaopan");

this.timeLabel = this.$("timeLabel");

this.hour = this.$("hour");

this.minute = this.$("minute");

this.second = this.$("second");

this.nowHour = null;

this.nowMinute = null;

this.nowSecond = null;

this.timer = null;

var _this = this;

//初始化函数

var init = function () {

_this.getNowTime();

_this.initClock();

_this.InterVal();

}

init();

}

Clock.prototype.$ = function (id) {

return document.getElementById(id)

}

Clock.prototype.CreateKeDu = function (className, deg, translateWidth) {

var Pointer = document.createElement("div");

Pointer.className = className

Pointer.style.transform = "rotate(" + deg + "deg) translate(" + translateWidth + "px)";

this.main.appendChild(Pointer);

}

Clock.prototype.getNowTime = function () {

var now = new Date();

this.nowHour = now.getHours();

this.nowMinute = now.getMinutes();

this.nowSecond = now.getSeconds();

}

Clock.prototype.setPosition = function () {

this.second.style.transform = "rotate(" + (this.nowSecond * 6 - 90) + "deg)";

this.minute.style.transform = "rotate(" + (this.nowMinute * 6 + 1 / 10 * this.nowSecond - 90) + "deg)";

this.hour.style.transform = "rotate(" + (this.nowHour * 30 + 1 / 2 * this.nowMinute + 1 / 120 * this.nowSecond - 90) + "deg)";

}

Clock.prototype.initClock = function () {

//初始化timeLabel

this.timeLabel.innerHTML = this.nowHour + ":" + this.nowMinute + ":" + this.nowSecond;

//初始化表盘

for (var index = 0; index < 4; index++) {

this.CreateKeDu("hourPointer", index * 90, 138);

}

for (var index = 0; index < 12; index++) {

this.CreateKeDu("minuterPointer", index * 30, 140);

}

for (var index = 0; index < 60; index++) {

this.CreateKeDu("secondPointer", index * 6, 142);

}

this.setPosition();

}

Clock.prototype.InterVal = function () {

clearInterval(this.timer);

var _this = this;

this.timer = setInterval(function () {

_this.getNowTime();

_this.second.style.transform = "rotate(" + (_this.nowSecond * 6 - 90) + "deg)";

_this.minute.style.transform = "rotate(" + (_this.nowMinute * 6 + 1 / 10 * _this.nowSecond - 90) + "deg)";

_this.hour.style.transform = "rotate(" + (_this.nowHour * 30 + 1 / 2 * _this.nowMinute + 1 / 120 * _this.nowSecond - 90) + "deg)";

_this.timeLabel.innerHTML = _this.nowHour + ":" + _this.nowMinute + ":" + _this.nowSecond;

}, 1000);

}

最后调用如下：

代码如下:

window.onload = function () {

new Clock();

}

最终页面代码：

代码如下:

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总结：本例中使用了css3 的transform属性中的 rotate的旋转效果和translate的位移效果。

以上所述就是本文的全部内容了，希望本文能够对大家学习CSS3有所帮助。

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