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■ 語法主題：火車向前走

■ 控制碼內容：
將下面複製至 <body> 標籤後

<div id="dot0" style="position: absolute; visibility: hidden; height: 32; width: 32;"><img src="h012_train.gif" ></div>
<div id="dot1" style="position: absolute;height: 32; width: 32;"><img src="h012_train.gif" ></div>
<div id="dot2" style="position: absolute;height: 32; width: 32;"><img src="h012_train.gif" ></div>
<div id="dot3" style="position: absolute; height: 32; width: 32;"><img src="h012_train.gif" ></div>
<div id="dot4" style="position: absolute; height: 32; width: 32;"><img src="h012_train.gif" ></div>

for (i = start ; i < nDots; i++ ) {
var spring = new vec(0, 0);
if (i > 0) {
springForce(i-1, i, spring);
}
if (i < (nDots - 1)) {
springForce(i+1, i, spring);
}
var resist = new vec(-dots[i].dx * RESISTANCE,
-dots[i].dy * RESISTANCE);
var accel = new vec((spring.X + resist.X)/ MASS,
(spring.Y + resist.Y)/ MASS + GRAVITY);

dots[i].dx += (DELTAT * accel.X);
dots[i].dy += (DELTAT * accel.Y);

if (Math.abs(dots[i].dx) < STOPVEL &&
Math.abs(dots[i].dy) < STOPVEL &&
Math.abs(accel.X) < STOPACC &&
Math.abs(accel.Y) < STOPACC) {
dots[i].dx = 0;
dots[i].dy = 0;
}
dots[i].X += dots[i].dx;
dots[i].Y += dots[i].dy;
var height, width;
if (isNetscape) {
height = window.innerHeight + document.scrollTop;
width = window.innerWidth + document.scrollLeft;
} else {
height = document.body.clientHeight + document.body.scrollTop;
width = document.body.clientWidth + document.body.scrollLeft;
}
if (dots[i].Y >= height - DOTSIZE - 1) {
if (dots[i].dy > 0) {
dots[i].dy = BOUNCE * -dots[i].dy;
}
dots[i].Y = height - DOTSIZE - 1;
}
if (dots[i].X >= width - DOTSIZE) {
if (dots[i].dx > 0) {
dots[i].dx = BOUNCE * -dots[i].dx;
}
dots[i].X = width - DOTSIZE - 1;
}
if (dots[i].X < 0) {
if (dots[i].dx < 0) {
dots[i].dx = BOUNCE * -dots[i].dx;
}
dots[i].X = 0;
}

dots[i].obj.left = dots[i].X;
dots[i].obj.top = dots[i].Y;
}
}
</script>