<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>幀動畫</title>
</head>
<body>
<canvas id="canvas" width="400" height="300"></canvas>
<div class="">
<button class="start-btn" type="button">重新吃</button>
<button class="end-btn" type="button">不吃了</button>
<button class="pause-btn" type="button">歇一歇</button>
<button class="continue-btn" type="button">繼續吃</button>
</div>
<script type="text/javascript">
const canvas = document.getElementById("canvas")
canvas.style.border = "1px solid black"
const ctx = canvas.getContext("2d")
const img = new Image() // 創建圖片對象
let timer // 定時器標識符
let millisec = 300 // 執行時間間隔
let colIndex = 0 // 列數
let rowIndex = 0 // 行數
const timerFun = () => { // 聲明定時器執行函數
console.log("設置定時器");
ctx.clearRect(0, 0, canvas.style.width, canvas.style.height) // 清除畫布
if (rowIndex < 3) { // 如果是前5幀
ctx.drawImage(img, colIndex * 240, rowIndex * 240, 200, 200, 50, 50, 200, 200) // 圖片對象，x坐標，y坐標（注：圖片上定位的坐標），width，height（圖片上截取的大小），x坐標，y坐標（注：圖片在畫布上的起點，即左上角），width，height（縮放，不是裁剪）
colIndex++ // 下一幀
if (colIndex > 4) {
colIndex = 0
rowIndex++
}
} else {
colIndex = 0
rowIndex = 0
}
}
img.onload = () => {
timer = setInterval(timerFun, millisec)
}
img.src = "image/apple.jpg"
const startBtn = document.getElementsByClassName('start-btn')[0]
const endBtn = document.getElementsByClassName('end-btn')[0]
const pauseBtn = document.getElementsByClassName('pause-btn')[0]
const continueBtn = document.getElementsByClassName('continue-btn')[0]
startBtn.addEventListener('click', () => {
console.log("點擊開始", timer)
clearInterval(timer)
colIndex = 0 // 列數
rowIndex = 0 // 行數
timer = setInterval(timerFun, millisec)
})
endBtn.addEventListener('click', () => {
console.log("點擊結束", timer)
clearInterval(timer)
colIndex = 0
rowIndex = 0
ctx.drawImage(img, colIndex * 240, rowIndex * 240, 200, 200, 50, 50, 200, 200)
timer = 0
})
pauseBtn.addEventListener('click', () => {
console.log("點擊暫停", timer)
clearInterval(timer)
timer = 0
})
continueBtn.addEventListener('click', () => {
if (timer) {
alert('吃著呢，別催')
return
}
console.log("點擊繼續", timer)
timer = setInterval(timerFun, millisec)
})
</script>
</body>
</html>
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