整理文档，搜刮出一个vue 计时器组件的代码，稍微整理精简一下做下分享。

<template> <div> <span :sendSync="sendSync" :autoStart="autoStart" :defaultVal="defaultVal" >{{countString}}</span> </div></template><script>export default { data() { return { isStart: false, globalTimer: null,//获取setInterval对象值 countString: '0秒', //用来显示时间 day: 0, hour: 0, minute: 0, second: 0, millisecond: 0, countVal: this.defaultVal, //获取初始值 pauseTime: 0, } }, watch: { 'countString': { deep: true, handler: function(val, oldVal) { var vm = this if (vm.needSendSunc) { vm.passToParent(val) } } }, 'needSendSunc': { deep: true, handler: function(val) { var vm = this if (val) { vm.passToParent(vm.countString) } } } }, props: { sendSync: { type: Boolean, default: false, }, autoStart: { type: Boolean, default: false, }, defaultVal: { type: Number, default: 0, } }, mounted() { var vm = this if (vm.autoStart) { vm.startCountFn() } }, computed: { needSendSunc: function() { return this.sendSync } }, created: function() { this.$on('startCount', function() { this.startCountFn() }); this.$on('stopCount', function() { this.stopCountFn() }); }, components: {}, methods: { counterFn: function(counterTime) { var vm = this var nowDate = new Date().getTime() if(vm.pauseTime == 0){ var num = nowDate - counterTime //计算时间毫秒差 }else{ vm.pauseTime = vm.pauseTime +10 var num = vm.pauseTime - counterTime //计算时间毫秒差 } var leave1 = num % (24 * 3600 * 1000) //计算天数后剩余的毫秒数 var leave2 = leave1 % (3600 * 1000) //计算小时数后剩余的毫秒数 var leave3 = leave2 % (60 * 1000) //计算分钟数后剩余的毫秒数 vm.day = Math.floor(num / (24 * 3600 * 1000)) //计算相差天数 vm.hour = Math.floor(leave1 / (3600 * 1000))//计算相差小时 vm.minute = Math.floor(leave2 / (60 * 1000))//计算相差分钟 vm.second = Math.round(leave3 / 1000) //计算相差秒 if (vm.day > 0) { vm.countString = `${vm.day}天 ${vm.hour}小时 ${vm.minute}分 ${vm.second}秒`; } else if (vm.hour > 0) { vm.countString = `${vm.hour}小时 ${vm.minute}分 ${vm.second}秒`; } else if (vm.minute > 0) { vm.countString = `${vm.minute}分 ${vm.second}秒`; } else { vm.countString = `${vm.second}秒`; } }, startCountFn: function() { var vm = this if (!vm.isStart) { vm.countVal = vm.countVal ? vm.countVal : new Date().getTime() var timer = setInterval(function() { vm.counterFn(vm.countVal) }, 10) vm.globalTimer = timer vm.isStart = true } }, stopCountFn: function() { var vm = this if (vm.isStart) { window.clearInterval(vm.globalTimer) vm.globalTimer = null; vm.isStart = false vm.pauseTime = new Date().getTime() } }, passToParent: function(data) { var vm = this this.$emit("getDataFromChild", data) }, }}</script><style></style>

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