JS+CSS3实现时钟效果(抖音)

本文讲述了抖音上很火的时钟效果是怎么实现的，主要用到原生态的 JS+CSS3，希望大家可以交流学习一下。

具体不解释了，看注释：

Title

html{

background: #000;

color: #666;

font-size: 12px;

overflow:hidden;

}

*{

margin: 0;

padding: 0;

}

span{

display: block;

float: left;

}

.on{

color: #fff;

}

.wrapper{

width: 200px;

height: 200px;

position: absolute;

left:50%;

top:50%;

margin-top: -100px;

margin-left: -100px;

}

.wrapper .timebox{

position: absolute;

width: 200px;

height: 200px;

top: 0;

left:0;

border-radius: 100%;

transition: all 0.5s;

}

.timebox span{

transition: all 0.5s;

float: left;

}

.wrapper .timebox span{

position: absolute;

left:50%;

top:50%;

width: 40px;

height: 18px;

margin-top: -9px;

margin-left: -20px;

text-align: right;

}

let wrapper = document.getElementById("wrapper");

let yueBox = document.getElementById("yueBox");

let riqiBox = document.getElementById("riqiBox");

let hourbox = document.getElementById("hourbox");

let minutebox = document.getElementById("minutebox");

let secondbox = document.getElementById("secondbox");

/*

* 找所有的东西标签函数

* */

let findSiblings = function( tag ){

let parent = tag.parentNode;

let childs = parent.children;

let sb = [];

for(let i=0 ; i <= childs.length-1 ; i++){

if( childs[i]!==tag){

sb[sb.length] = childs[i];

}

}

return sb ;

};

/*

* 去掉所有兄弟的类

* */

let removeSiblingClass =function( tag ){

let sb = findSiblings( tag );

for(let i=0 ; i <= sb.length-1 ; i++){

sb[i].className = "";

}

};

/*

* 初始化月份函数

* */

let initMonth = function(){

for(let i=1; i<=12; i++){

let span = document.createElement("span");

span.innerHTML = i+"月";

yueBox.appendChild( span );

}

};

// 初始化日期

let initDate = function(){

for(let i=1; i<=31; i++){

let span = document.createElement("span");

span.innerHTML = i+"日";

riqiBox.appendChild( span );

}

};

// 初始化小时，分钟，秒

let initHour = function(){

for(let i=0; i<=23; i++){

let h = i ;

let span = document.createElement("span");

if( h<10){

h="0"+h;

}

span.innerHTML = h +"点";

hourbox.appendChild( span );

}

};

let initMinute = function(){

for(let i=0; i<=59; i++){

let f = i ;

let span = document.createElement("span");

if( f<10){

f="0"+f;

}

span.innerHTML = f +"分";

minutebox.appendChild( span );

}

};

let initSecond = function(){

for(let i=0; i<=59; i++){

let miao = i ;

let span = document.createElement("span");

if( miao<10){

miao="0"+miao;

}

span.innerHTML = miao +"秒";

secondbox.appendChild( span );

}

};

// 时间文字样式切换函数

let changeTime = function(tag){

tag.className = "on";

removeSiblingClass( tag );

};

/*

* 初始化日历函数

* */

let initRili = function(){

initMonth(); // 初始化月份

initDate(); // 初始化日期

initHour(); // 小时

initMinute();

initSecond();

};

/*

* 展示当前时间

* 参数：mydate 时间对象

* */

let showNow = function( mydate ){

let yue = mydate.getMonth() ;

let riqi = mydate.getDate();

let hour = mydate.getHours() ;

let minute = mydate.getMinutes();

let second = mydate.getSeconds();

// 时间文字样式切换函数

changeTime( yueBox.children[yue] );

changeTime( riqiBox.children[riqi-1] );

changeTime( hourbox.children[hour] );

changeTime( minutebox.children[minute] );

changeTime( secondbox.children[second] );

};

// 展示时间圆圈函数

// tag：目标

// num：数字数量

// dis：圆圈半径

let textRound = function(tag,num,dis){

let span = tag.children ;

for(let i=0 ; i<=span.length-1; i++){

span[i].style.transform="rotate("+ (360/span.length)*i+"deg) translateX("+dis+"px)" ;

}

};

/*

* 旋转指定“圆圈”指定度数

* */

let rotateTag = function(tag , deg){

tag.style.transform = "rotate("+deg+"deg)";

};

let main = function(){

initRili(); // 初始化日历

setInterval(function(){

let mydate = new Date();

showNow( mydate ); // 展示当前时间

},1000);

// n秒后，摆出圆形

setTimeout(function(){

wrapper.className = "wrapper";

textRound(yueBox,12,40);

textRound(riqiBox,31,80);

textRound(hourbox,24,120);

textRound(minutebox,60,160);

textRound(secondbox,60,200);

setInterval(function(){

let mydate = new Date();

rotateTag( yueBox , -30*mydate.getMonth());

rotateTag( riqiBox , -360/31*(mydate.getDate()-1) );

rotateTag( hourbox , -360/24*mydate.getHours());

rotateTag( minutebox , -6*mydate.getMinutes());

rotateTag( secondbox , -6*mydate.getSeconds());

},1000)

},6000)

};

main();

感谢大家的阅读，大家学会了吗？

本文转自：https://blog.csdn.net/weixin_42703239/article/details/105012665

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