index.js
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import { VantComponent } from '../common/component';
import { isSameSecond, parseFormat, parseTimeData } from './utils';
function simpleTick(fn) {
return setTimeout(fn, 30);
}
VantComponent({
props: {
useSlot: Boolean,
millisecond: Boolean,
time: {
type: Number,
observer: 'reset'
},
format: {
type: String,
value: 'HH:mm:ss'
},
autoStart: {
type: Boolean,
value: true
}
},
data: {
timeData: parseTimeData(0),
formattedTime: '0'
},
destroyed() {
clearTimeout(this.tid);
this.tid = null;
},
methods: {
// 开始
start() {
if (this.counting) {
return;
}
this.counting = true;
this.endTime = Date.now() + this.remain;
this.tick();
},
// 暂停
pause() {
this.counting = false;
clearTimeout(this.tid);
},
// 重置
reset() {
this.pause();
this.remain = this.data.time;
this.setRemain(this.remain);
if (this.data.autoStart) {
this.start();
}
},
tick() {
if (this.data.millisecond) {
this.microTick();
}
else {
this.macroTick();
}
},
microTick() {
this.tid = simpleTick(() => {
this.setRemain(this.getRemain());
if (this.remain !== 0) {
this.microTick();
}
});
},
macroTick() {
this.tid = simpleTick(() => {
const remain = this.getRemain();
if (!isSameSecond(remain, this.remain) || remain === 0) {
this.setRemain(remain);
}
if (this.remain !== 0) {
this.macroTick();
}
});
},
getRemain() {
return Math.max(this.endTime - Date.now(), 0);
},
setRemain(remain) {
this.remain = remain;
const timeData = parseTimeData(remain);
if (this.data.useSlot) {
this.$emit('change', timeData);
}
this.setData({
formattedTime: parseFormat(this.data.format, timeData)
});
if (remain === 0) {
this.pause();
this.$emit('finish');
}
}
}
});