Vue-cli框架实现计时器应用

技术背景

本应用使用 vue-cli 框架，并使用了自定义组件（将按钮拆分成单独的组件）和vue 模板。

使用说明

开始正计时：点击工具栏的“开始正计时”按钮即可，快捷键为"Enter"键。

开始倒计时：在输入框内写入时间后，点击“开始倒计时”按钮，即可开始倒计时。

暂停计时器：点击“暂停计时器”按钮即可暂停。

清空正/倒计时：点击此按钮，计时器便会回到初始状态，等待新的计时。

重新再计时：点击此按钮，计时器便会重新开始此次计时。

恢复计时器：点击此按钮即可从暂停状态中恢复。

代码

首先初始化项目

vue init webpack <project name>

components文件夹中放入文件：CounterButton.vue

<template>
  <div>
    <button v-bind:class="styleObject" v-on:click="$emit('click-button')">{{ text }}</button>
  </div>
</template>

<script>
export default {
  name: "CounterButton",
  props: {
    text: String
  },
  data: function() {
    return {
      styleObject: {
        countup: false,
        countdown: false,
        clear: false,
        pause: false,
        restart: false,
        resume: false
      }
    };
  },
  created: function() {
    if (this.text == "开始正计时") {
      this.styleObject.countup = true;
    } else if (this.text == "开始倒计时") {
      this.styleObject.countdown = true;
    } else if (this.text == "清空倒计时" || this.text == "清空正计时") {
      this.styleObject.clear = true;
    } else if (this.text == "暂停计时器") {
      this.styleObject.pause = true;
    } else if (this.text == "重新再计时") {
      this.styleObject.restart = true;
    } else if (this.text == "恢复计时器") {
      this.styleObject.resume = true;
    }
  }
};
</script>

<style>
.countup {
  background-color: #2188e9;
  border-radius: 5px;
  border-color: #2188e9;
  position: absolute;
  left: 310px;
  top: 15px;
  width: 98px;
  height: 40px;
  font-family: PingFangSC-Regular, "PingFang SC", sans-serif;
  font-size: 16px;
  color: #ffffff;
}

.countdown {
  background-color: #2188e9;
  border-radius: 5px;
  border-color: #2188e9;
  position: absolute;
  left: 428px;
  top: 15px;
  width: 98px;
  height: 40px;
  font-family: PingFangSC-Regular, "PingFang SC", sans-serif;
  font-size: 16px;
  color: #ffffff;
}

.clear {
  background-color: #dd2e1d;
  border-radius: 5px;
  border-color: #dd2e1d;
  position: absolute;
  left: 964px;
  top: 15px;
  width: 98px;
  height: 40px;
  font-family: PingFangSC-Regular, "PingFang SC", sans-serif;
  font-size: 16px;
  color: #ffffff;
}

.pause {
  background-color: #2188e9;
  border-radius: 5px;
  border-color: #2188e9;
  position: absolute;
  left: 227px;
  top: 15px;
  width: 98px;
  height: 40px;
  font-family: PingFangSC-Regular, "PingFang SC", sans-serif;
  font-size: 16px;
  color: #ffffff;
}

.restart {
  background-color: #ffb020;
  border-radius: 5px;
  border-color: #ffb020;
  position: absolute;
  left: 1082px;
  top: 15px;
  width: 98px;
  height: 40px;
  font-family: PingFangSC-Regular, "PingFang SC", sans-serif;
  font-size: 16px;
  color: #ffffff;
}

.resume {
  background-color: #2188e9;
  border-radius: 5px;
  border-color: #2188e9;
  position: absolute;
  left: 227px;
  top: 15px;
  width: 98px;
  height: 40px;
  font-family: PingFangSC-Regular, "PingFang SC", sans-serif;
  font-size: 16px;
  color: #ffffff;
}
</style>

将App.vue改为

<template>
<div id="app">
<div class="toolbar">
<div v-show="initialSeen">
<input v-model="hour" id="hour" />
<input v-model="minute" id="minute" />
<input v-model="second" id="second" />
<span id="hourlabel">时</span>
<span id="minutelabel">分</span>
<span id="secondlabel">秒</span>
<counter-button text="开始正计时" v-on:click-button="startCountUp" id="countup"></counter-button>
<counter-button text="开始倒计时" v-on:click-button="startCountDown" id="countdown"></counter-button>
</div>
<span id="hint" v-show="hintSeen">{{ hint }}</span>
<counter-button v-bind:text="clearText" v-on:click-button="clearCounter" v-show="clearSeen" id="clear"></counter-button>
<counter-button text="暂停计时器" v-on:click-button="pauseCounter" v-show="pauseSeen" id="pause"></counter-button>
<counter-button text="重新再计时" v-on:click-button="restartCounter" v-show="restartSeen" id="restart"></counter-button>
<counter-button text="恢复计时器" v-on:click-button="resumeCounter" v-show="resumeSeen" id="resume"></counter-button>
</div>
<span id="time">{{ time }}</span>
</div>
</template>
<script>
import CounterButton from "./components/CounterButton";
export default {
name: "App",
data: function() {
return {
status: 1,
// status---1: before start; 2: up timing; 3: down timing; 4: up pausing;
// 5: down pausing; 6: down finished;
hour: null,
minute: null,
second: null,
time: "00:00:00",
timer: null,
Hour: 0,
Minute: 0,
Second: 0,
Millisecond: 0,
hourString: "",
minuteString: "",
secondString: "",
recordHour: 0,
recordMinute: 0,
recordSecond: 0,
recordMillisecond: 0,
hint: "正在倒计时 12:20:00",
clearText: "清空倒计时",
initialSeen: true,
clearSeen: false,
pauseSeen: false,
restartSeen: false,
resumeSeen: false,
hintSeen: false
};
},
methods: {
format: function(Hour, Minute, Second) {
if (Second < 10) {
this.secondString = "0" + Second;
} else {
this.secondString = Second;
}
if (Minute < 10) {
this.minuteString = "0" + Minute;
} else {
this.minuteString = Minute;
}
if (Hour < 10) {
this.hourString = "0" + Hour;
} else {
this.hourString = Hour;
}
return (
this.hourString + ":" + this.minuteString + ":" + this.secondString
);
},
changeStatus: function(aimStatus) {
if (aimStatus == 1) {
// before start
this.initialSeen = true;
this.clearSeen = false;
this.pauseSeen = false;
this.restartSeen = false;
this.resumeSeen = false;
this.hintSeen = false;
} else if (aimStatus == 2 || aimStatus == 3) {
// up timing || down timing
this.initialSeen = false;
this.clearSeen = true;
this.pauseSeen = true;
this.restartSeen = true;
this.resumeSeen = false;
this.hintSeen = true;
if (aimStatus == 2) {
this.hint = "正在正计时";
this.clearText = "清空正计时";
} else if (aimStatus == 3) {
this.recordHour = parseInt(this.recordMillisecond / 3600000);
this.recordMinute = parseInt(
(this.recordMillisecond % 3600000) / 60000
);
this.recordSecond = parseInt((this.recordMillisecond % 60000) / 1000);
this.hint =
"正在倒计时 " +
this.format(this.recordHour, this.recordMinute, this.recordSecond);
this.clearText = "清空倒计时";
}
} else if (aimStatus == 4 || aimStatus == 5) {
// up pausing || down pausing
this.initialSeen = false;
this.clearSeen = true;
this.pauseSeen = false;
this.restartSeen = true;
this.resumeSeen = true;
this.hintSeen = true;
if (aimStatus == 4) {
// up pausing
this.hint = "暂停正计时";
this.clearText = "清空正计时";
} else if (aimStatus == 5) {
// down pausing
this.recordHour = parseInt(this.recordMillisecond / 3600000);
this.recordMinute = parseInt(
(this.recordMillisecond % 3600000) / 60000
);
this.recordSecond = parseInt((this.recordMillisecond % 60000) / 1000);
this.hint =
"暂停倒计时 " +
this.format(this.recordHour, this.recordMinute, this.recordSecond);
this.clearText = "清空倒计时";
}
} else if (aimStatus == 6) {
// down finished
this.initialSeen = false;
this.clearSeen = true;
this.pauseSeen = false;
this.restartSeen = true;
this.resumeSeen = false;
this.hintSeen = true;
this.recordHour = parseInt(this.recordMillisecond / 3600000);
this.recordMinute = parseInt(
(this.recordMillisecond % 3600000) / 60000
);
this.recordSecond = parseInt((this.recordMillisecond % 60000) / 1000);
this.hint =
"倒计时 " +
this.format(this.recordHour, this.recordMinute, this.recordSecond) +
" 已结束";
}
},
CountUp: function() {
this.Millisecond += 50;
this.Hour = parseInt(this.Millisecond / 3600000);
this.Minute = parseInt((this.Millisecond % 3600000) / 60000);
this.Second = parseInt((this.Millisecond % 60000) / 1000);
this.time = this.format(this.Hour, this.Minute, this.Second);
},
CountDown: function() {
this.Millisecond -= 50;
this.Hour = parseInt(this.Millisecond / 3600000);
this.Minute = parseInt((this.Millisecond % 3600000) / 60000);
this.Second = parseInt((this.Millisecond % 60000) / 1000);
if (this.Millisecond <= 0) {
clearInterval(this.timer);
this.changeStatus(6);
}
this.time = this.format(this.Hour, this.Minute, this.Second);
},
startCountUp: function() {
this.status = 2;
this.Millisecond = 0;
this.changeStatus(this.status);
this.timer = setInterval(this.CountUp, 50);
},
startCountDown: function() {
this.status = 3;
this.Hour = this.hour;
if (this.minute > 59) {
this.Minute = 59;
} else {
this.Minute = this.minute;
}
if (this.second > 59) {
this.Second = 59;
} else {
this.Second = this.second;
}
this.hour = null;
this.minute = null;
this.second = null;
this.Millisecond =
this.Hour * 3600000 + this.Minute * 60000 + this.Second * 1000;
this.recordMillisecond = this.Millisecond;
this.changeStatus(this.status);
this.timer = setInterval(this.CountDown, 50);
},
clearCounter: function() {
this.status = 1;
this.changeStatus(this.status);
clearInterval(this.timer);
this.time = this.format(0, 0, 0);
},
pauseCounter: function() {
if (this.status == 2) {
// Now count up
this.status = 4;
this.changeStatus(this.status);
clearInterval(this.timer);
} else if (this.status == 3) {
// now count down
this.status = 5;
this.changeStatus(this.status);
clearInterval(this.timer);
}
},
restartCounter: function() {
if (this.status == 2 || this.status == 4) {
this.status = 2;
this.Millisecond = 0;
this.changeStatus(this.status);
clearInterval(this.timer);
this.timer = setInterval(this.CountUp, 50);
} else if ((this.status = 3 || this.status == 5 || this.status == 6)) {
this.status = 3;
this.Millisecond = this.recordMillisecond;
this.changeStatus(this.status);
clearInterval(this.timer);
this.timer = setInterval(this.CountDown, 50);
}
},
resumeCounter: function() {
if (this.status == 4) {
this.status = 2;
this.changeStatus(this.status);
this.timer = setInterval(this.CountUp, 50);
} else if ((status = 5)) {
this.status = 3;
this.changeStatus(this.status);
this.timer = setInterval(this.CountDown, 50);
}
},
// 键盘事件
handleKeyup(event) {
const e = event || window.event || arguments.callee.caller.arguments[0];
if (!e) return;
const { key, keyCode } = e;
if (key == "Enter") {
if (this.status == 1) {
// before start
this.status = 2;
this.Millisecond = 0;
this.changeStatus(this.status);
this.timer = setInterval(this.CountUp, 50);
}
} else if (keyCode == 32) {
if (this.status == 2) {
// Now count up
this.status = 4;
this.changeStatus(this.status);
clearInterval(this.timer);
} else if (this.status == 3) {
// now count down
this.status = 5;
this.changeStatus(this.status);
clearInterval(this.timer);
} else if (this.status == 4) {
this.status = 2;
this.changeStatus(this.status);
this.timer = setInterval(this.CountUp, 50);
} else if (this.status == 5) {
this.status = 3;
this.changeStatus(this.status);
this.timer = setInterval(this.CountDown, 50);
}
}
}
},
mounted: function() {
window.addEventListener("keyup", this.handleKeyup);
},
destroyed() {
window.removeEventListener("keyup", this.handleKeyup);
},
components: {
CounterButton
}
};
</script>
<style>
body {
margin: 0;
padding: 0;
}
.toolbar {
background-color: #97a5bc;
width: 1220px;
height: 70px;
}
#hour {
background-color: white;
border-radius: 5px;
position: absolute;
left: 40px;
top: 15px;
width: 69px;
height: 34px;
font-size: 15px;
}
#hourlabel {
position: absolute;
left: 86px;
top: 24px;
font-family: PingFangSC-Regular, "PingFang SC", sans-serif;
font-size: 16px;
color: #222222;
}
#minute {
background-color: white;
border-radius: 5px;
position: absolute;
left: 130px;
top: 15px;
width: 69px;
height: 34px;
font-size: 15px;
}
#minutelabel {
position: absolute;
left: 177px;
top: 24px;
font-family: PingFangSC-Regular, "PingFang SC", sans-serif;
font-size: 16px;
color: #222222;
}
#second {
background-color: white;
border-radius: 5px;
position: absolute;
left: 220px;
top: 15px;
width: 69px;
height: 34px;
font-size: 15px;
}
#secondlabel {
position: absolute;
left: 268px;
top: 24px;
font-family: PingFangSC-Regular, "PingFang SC", sans-serif;
font-size: 16px;
color: #222222;
}
#time {
position: absolute;
left: 131px;
top: 197px;
font-size: 200px;
font-family: PTMono-Bold, "PT Mono", monospace;
font-weight: 700;
color: #333333;
}
#hint {
position: absolute;
left: 40px;
top: 24px;
font-family: PTMono-Bold, "PT Mono", monospace;
font-size: 16px;
color: white;
}
</style>

最后在目录中使用

npm run dev

即可运行该项目。

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