? ??? ??? JavaScript ??? ?? ???? ??? ??? VUE ?? ??? ?????? ?? ?????. ?? ??? ??? ?? ? ?? ???? ??? ???? ???? UI ???? ??????. ? ??? ??? ??? ????.

? Vue? ?????? ?? ? ?? ??? :

• ??? ? UI ? ??? ?? : ?? JavaScript ??? timerInterval ?? ??? ??? ???? DOM ??? ?? ?????. VUE? ??? ??? DOM? ?? ??? ???? ????? ????? UI ????? ??????.
• ??? ? : ?? ???? ?? ID? ???? ??? ?? ?????. VUE ?? ??? ??? ????? ?? ????? ?? ?? ??? ????? ???????.

VUE ??? ??? ????.

??? ? ???

Vue? HTML ?? ??? ???? ?????. ?? ????? BaseTimer.vue ??? ?? ????.

<code><template>
  
</template>

<script>
  // ...
</script>

<style scoped>
  /* ... */
</style></code>

???<template></template> ???? ???? ?? ? (?? ?? ??? SVG)? ???? ????.

<template>
  <div class="base-timer">
    <svg viewbox="0 0 100 100" xmlns="http://www.w3.org/2000/svg">
      <g>
        <circle cx="50" cy="50" r="45"></circle>
        <path :class="remainingPathColor" :stroke-dasharray="circleDasharray" d="
            M 50, 50
            m -45, 0
            a 45,45 0 1,0 90,0
            a 45,45 0 1,0 -90,0
          "></path>
      </g>
    </svg>
    {{ formattedTimeLeft }}
  </div>
</template>

<style scoped>
.base-timer {
  position: relative;
  width: 100px;
  height: 100px;
}
</style>???? ?? ??? ??? ??? : <code>stroke-dasharray</code> , <code>remainingPathColor</code> ? <code>formatTime(timeLeft)</code> ?? ?????.<h3> ?? ? ??</h3><p> ???<script> section defines constants and variables.  Constants, such as <code>FULL_DASH_ARRAY, <code>WARNING_THRESHOLD, <code>ALERT_THRESHOLD, and <code>COLOR_CODES, are defined directly.</script></p>
<p>Variables are categorized: those directly re-assigned in methods (<code>timerInterval</code>, <code>timePassed</code>) and those dependent on other variables (<code>timeLeft</code>, <code>remainingPathColor</code>).</p>
<h4>Reactive Variables</h4>
<p>Variables directly modified in methods are declared within the <code>data()</code> method to leverage Vue's reactivity system:</p>
<pre class="brush:php;toolbar:false">data() {
  return {
    timePassed: 0,
    timerInterval: null
  };
},

Computed Properties

Variables dependent on other variables are implemented as computed properties:

computed: {
  timeLeft() {
    return TIME_LIMIT - this.timePassed;
  },
  circleDasharray() {
    return `${(this.timeFraction * FULL_DASH_ARRAY).toFixed(0)} 283`;
  },
  formattedTimeLeft() {
    // ... (time formatting logic) ...
  },
  timeFraction() {
    // ... (time fraction calculation) ...
  },
  remainingPathColor() {
    // ... (color calculation based on timeLeft) ...
  }
},

Computed properties are pure functions, cached for efficiency.

Using Data and Computed Properties in the Template

The template utilizes text interpolation ({{ ... }}) and v-bind (or its shorthand :) directives to dynamically bind data and computed properties to the DOM.

Methods and Lifecycle Hooks

The startTimer method, simplified due to the use of computed properties, is called within the mounted() lifecycle hook:

methods: {
  startTimer() {
    this.timerInterval = setInterval(() => (this.timePassed  = 1), 1000);
  }
},
mounted() {
  this.startTimer();
},

Component Usage

To use the BaseTimer component in another component (e.g., App.vue):

1. Import: import BaseTimer from "./components/BaseTimer";
2. Register: components: { BaseTimer }
3. Instantiate: <basetimer></basetimer> in the template.

This refactoring demonstrates the benefits of using Vue components for improved code organization, reusability, and efficient state management. The resulting component is self-contained and easily integrated into larger applications.

? ??? ??? JavaScript?? ??? ??? VUE ?? ??? ?????? ?? ?????. ??? ??? PHP ??? ????? ?? ?? ??? ?????!