js实现动态时钟

以你之姓@ 2021-10-26 13:22 460阅读 0赞

> 发现一个超级好用的gif图工具"抠抠视频秀"，很好用也不占内存，长这样  
> ![在这里插入图片描述][20190820011431901.png]

1.  效果图  
    ![在这里插入图片描述][20190820005949844.gif]
2.  设计思路

> 1.调整各个指针的位置关系（`transform-origin`:）  
> 2. 计算好各个针之间的度数关系 （分针和时针的度数都不仅仅由自身时间决定）  
> 3. 由于指针初始摆放位置为三点钟方向，所以相对于摆放位置，要正常显示时间需要在计算好的角度基础上-90

> 关于转动角度的关系具体如下：1 hour=60min =3600s  
> 先分别转动对应针的角度，此时应考虑**联动**。秒针每秒走6度；  
> 分针每分钟走6度（在考虑秒针对 分针的影响，将秒数换算成分钟）  
> 时针每小时走30度，考虑分针和秒针的影响

1.  代码如下  
    **样式**

**html**

最后分享一个见到的实现很棒的动态时钟，但是没有使用图片，而是代码绘制！效果如下  
![在这里插入图片描述][20190820011936372.gif]  
代码如下

<!DOCTYPE html>
    <html>
    <head lang="en">
        <meta charset="UTF-8">
        <title></title>
        <style>
            /* 全局 */
            *{ 
                margin:0;
                padding:0;
            }
            .clock{ 
                width:400px;
                height:400px;
                border:10px solid #333;
                box-shadow: 0 0 20px 3px #444 inset;
                border-radius:210px;
                position:relative;
                margin:5px auto;
                z-index:10;
                background-color:#f6f6f6;
            }
            /* 时钟数字 */
            .clock-num{ 
                width:40px;
                height:40px;
                font-size:22px;
                text-align:center;
                line-height:40px;
                position:absolute;
                z-index:8;
                color:#555;
                font-family:fantasy, 'Trebuchet MS';
            }
            .em_num{ 
                font-size:28px;
            }
            /* 指针 */
            .clock-line{ 
                position:absolute;
                z-index:20;
            }
            .hour-line{ width:100px;
                height:4px;
                top:198px;
                left:200px;
                background-color:#000;
                border-radius:2px;
                transform-origin:0 50%;
                box-shadow:1px -3px 8px 3px #aaa;
            }
            .minute-line{ 
                width:130px;
                height:2px;
                top:199px;
                left:190px;
                background-color:#000;
                transform-origin:7.692% 50%;
                box-shadow:1px -3px 8px 1px #aaa;
            }
            .second-line{ 
                width:170px;
                height:1px;
                top:199px;
                left:180px;
                background-color:#f60;
                transform-origin:11.765% 50%;
                box-shadow:1px -3px 7px 1px #bbb;
            }
            /* 原点 */
            .origin{ 
                width:20px;
                height:20px;
                border-radius:10px;
                background-color:#000;
                position:absolute;
                top:190px;
                left:190px;
                z-index:14;
            }
    
            /* 日期 时间 */
            .date-info{ 
                width:160px;
                height:28px;
                line-height:28px;
                text-align:center;
                position:absolute;
                top:217px;
                left:120px;
                z-index:11;
                color:#555;
                font-weight:bold;
            }
            .time-info{ 
                width:92px;
                height:30px;
                line-height:30px;
                text-align:center;
                position:absolute;
                top:270px;
                left:154px;
                z-index:11;
                background-color:#555;
                padding:0;
                box-shadow:0 0 9px 2px #222 inset;
            }
            .time{ 
                width:30px;
                height:30px;
                text-align:center;
                float:left;
                color:#fff;
                font-weight:bold;
            }
            #minute-time{ 
                border-left:1px solid #fff;
                border-right:1px solid #fff;
            }
    
            /* 刻度 */
            .clock-scale{ 
                width:195px;
                height:2px;
                transform-origin:0% 50%;
                z-index:7;
                position:absolute;
                top:199px;
                left:200px;
            }
            .scale-show{ 
                width:12px;
                height:2px;
                background-color:#555;
                float:left;
            }
            .scale-hidden{ 
                width:183px;
                height:2px;
                float:left;
            }
        </style>
    </head>
    <body>
    <div class="clock" id="clock">
        
        <div class="origin"></div>
    
        
        <div class="clock-line hour-line" id="hour-line"></div>
        <div class="clock-line minute-line" id="minute-line"></div>
        <div class="clock-line second-line" id="second-line"></div>
    
        
        <div class="date-info" id="date-info"></div>
        
        <div class="time-info" >
            <div class="time" id="hour-time"></div>
            <div class="time" id="minute-time"></div>
            <div class="time" id="second-time"></div>
        </div>
    </div>
    
    <script>
        (function(){ 
            window.onload=initNumXY(200, 160, 40,40);
            var hour_line = document.getElementById("hour-line");
            var minute_line = document.getElementById("minute-line");
            var second_line = document.getElementById("second-line");
            var date_info = document.getElementById("date-info");
            var week_day = [
                '星期日', '星期一', '星期二', '星期三', '星期四', '星期五', '星期六'
            ];
            var hour_time = document.getElementById("hour-time");
            var minute_time = document.getElementById("minute-time");
            var second_time = document.getElementById("second-time");
            function setTime(){ 
                var this_day = new Date();
                var hour = (this_day.getHours() >= 12) ?
                        (this_day.getHours() - 12) : this_day.getHours();
                var minute = this_day.getMinutes();
                var second = this_day.getSeconds();
                var hour_rotate = (hour*30-90) + (Math.floor(minute / 12) * 6);
                var year = this_day.getFullYear();
                var month = ((this_day.getMonth() + 1) < 10 ) ?
                "0"+(this_day.getMonth() + 1) : (this_day.getMonth() + 1);
                var date = (this_day.getDate() < 10 ) ?
                "0"+this_day.getDate() : this_day.getDate();
                var day = this_day.getDay();
                hour_line.style.transform = 'rotate(' + hour_rotate + 'deg)';
                minute_line.style.transform = 'rotate(' + (minute*6 - 90) + 'deg)';
                second_line.style.transform = 'rotate(' + (second*6 - 90)+'deg)';
                date_info.innerHTML =
                        year + "-" + month + "-" + date + " " + week_day[day];
                hour_time.innerHTML = (this_day.getHours() < 10) ?
                "0" + this_day.getHours() : this_day.getHours();
                minute_time.innerHTML = (this_day.getMinutes() < 10) ?
                "0" + this_day.getMinutes() : this_day.getMinutes();
                second_time.innerHTML = (this_day.getSeconds() < 10) ?
                "0" + this_day.getSeconds():this_day.getSeconds();
            }
            setInterval(setTime, 1000);
    
            function initNumXY(R, r, w, h){ 
                var numXY = [
                    { 
                        "left" : R + 0.5 * r - 0.5 * w,
                        "top" : R - 0.5 * r * 1.73205 - 0.5 * h
                    },
                    { 
                        "left" : R + 0.5 * r * 1.73205 - 0.5 * w,
                        "top" : R - 0.5 * r - 0.5 * h
                    },
                    { 
                        "left" : R + r - 0.5 * w,
                        "top" : R - 0.5 * h
                    },
                    { 
                        "left" : R + 0.5 * r * 1.73205 - 0.5 * w,
                        "top" : R + 0.5 * r - 0.5 * h
                    },
                    { 
                        "left" : R + 0.5 * r - 0.5 * w,
                        "top" : R + 0.5 * r * 1.732 - 0.5 * h
                    },
                    { 
                        "left" : R - 0.5 * w,
                        "top" : R + r - 0.5 * h
                    },
                    { 
                        "left" : R - 0.5 * r - 0.5 * w,
                        "top" : R + 0.5 * r * 1.732 - 0.5 * h
                    },
                    { 
                        "left" : R - 0.5 * r * 1.73205 - 0.5 * w,
                        "top" : R + 0.5 * r - 0.5 * h
                    },
                    { 
                        "left" : R - r - 0.5 * w,
                        "top" : R - 0.5 * h
                    },
                    { 
                        "left" : R - 0.5 * r * 1.73205 - 0.5 * w,
                        "top" : R - 0.5 * r - 0.5 * h
                    },
                    { 
                        "left" : R - 0.5 * r - 0.5 * w,
                        "top": R - 0.5 * r * 1.73205 - 0.5 * h
                    },
                    { 
                        "left" : R - 0.5 * w,
                        "top" : R - r - 0.5 * h
                    }
                ];
                var clock = document.getElementById("clock");
                for(var i = 1; i <= 12; i++){ 
                    if(i%3 == 0) { 
                        clock.innerHTML += "<div class='clock-num em_num'>"+i+"</div>";
                    } else { 
                        clock.innerHTML += "<div class='clock-num'>" + i + "</div>";
                    }
                }
                var clock_num = document.getElementsByClassName("clock-num");
                for(var i = 0; i < clock_num.length; i++) { 
                    clock_num[i].style.left = numXY[i].left + 'px';
                    clock_num[i].style.top = numXY[i].top + 'px';
                }
                for(var i = 0; i < 60; i++) { 
                    clock.innerHTML += "<div class='clock-scale'> " +
                            "<div class='scale-hidden'></div>" +
                            "<div class='scale-show'></div>" +
                            "</div>";
                }
                var scale = document.getElementsByClassName("clock-scale");
                for(var i = 0; i < scale.length; i++) { 
                    scale[i].style.transform="rotate(" + (i * 6 - 90) + "deg)";
                }
            }
        })();
    </script>
    </body>
    </html>

[20190820011431901.png]: /images/20211026/b4fa39e440a04ed296eaacf0283226ca.png
[20190820005949844.gif]: /images/20211026/9b7a886ce6954de5bccbca7e2ca5fe9b.png
[20190820011936372.gif]: /images/20211026/48aeedf1a12848d584c40135ac8e0f44.png