css3-手把手 transform 小时钟_html/css_WEB-ITnose

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

1. 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：

css 代码如下：

 1  

　　2. 初始化默认时间，和表盘刻度 ，效果如下：

更改后的css代码：

初始化 js代码：

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：

 //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：

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：

window.onload = function () {            new Clock();        }

最终页面代码：

 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，关于transform的使用 请参考  http://www.w3school.com.cn/cssref/pr_transform.asp