📄 0093.htm
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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; } // move img to new position dots[i].obj.left = dots[i].X; dots[i].obj.top = dots[i].Y; }}// end code hiding --></script> <div class=explain id=redirection></div> 提示:试试把鼠标放到左上角的小球上</td> </tr> <tr> <td>1.将下面的代码复制到<body>内 <br> <DIV id=dot0 <br> style="VISIBILITY: hidden; WIDTH: 11px; POSITION: absolute; HEIGHT: 11px"><IMG <br> height=11 src="/tempimgs/js/bullet1.gif" width=11></DIV><br> <DIV id=dot1 style="WIDTH: 11px; POSITION: absolute; HEIGHT: 11px"><IMG <br> height=11 src="/tempimgs/js/bullet1.gif" width=11></DIV><br> <DIV id=dot2 style="WIDTH: 11px; POSITION: absolute; HEIGHT: 11px"><IMG <br> height=11 src="/tempimgs/js/bullet1.gif" width=11></DIV><br> <DIV id=dot3 style="WIDTH: 11px; POSITION: absolute; HEIGHT: 11px"><IMG <br> height=11 src="/tempimgs/js/bullet1.gif" width=11></DIV><br> <DIV id=dot4 style="WIDTH: 11px; POSITION: absolute; HEIGHT: 11px"><IMG <br> height=11 src="/tempimgs/js/bullet1.gif" width=11></DIV><br> <DIV id=dot5 style="WIDTH: 11px; POSITION: absolute; HEIGHT: 11px"><IMG <br> height=11 src="/tempimgs/js/bullet1.gif" width=11></DIV><br> <DIV id=dot6 style="WIDTH: 11px; POSITION: absolute; HEIGHT: 11px"><IMG <br> height=11 src="/tempimgs/js/bullet1.gif" width=11></DIV><br> <SCRIPT language=JavaScript><br> <!-- hide code <p>var nDots = 7;<br> if (document.all&&window.print)<br> document.body.style.cssText="overflow-x:hidden;overflow-y:scroll"<br> var Xpos = 0;<br> var Ypos = 0;</p> <p> // fixed time step, no relation to real time<br> var DELTAT = .01;<br> // size of one spring in pixels<br> var SEGLEN = 10;<br> // spring constant, stiffness of springs<br> var SPRINGK = 10;<br> // all the physics is bogus, just picked stuff to<br> // make it look okay<br> var MASS = 1;<br> var GRAVITY = 50;<br> var RESISTANCE = 10;<br> // stopping criterea to prevent endless jittering<br> // doesn't work when sitting on bottom since floor<br> // doesn't push back so acceleration always as big<br> // as gravity<br> var STOPVEL = 0.1;<br> var STOPACC = 0.1;<br> var DOTSIZE = 11;<br> // BOUNCE is percent of velocity retained when <br> // bouncing off a wall<br> var BOUNCE = 0.75;</p> <p>var isNetscape = navigator.appName=="Netscape";</p> <p> // always on for now, could be played with to<br> // let dots fall to botton, get thrown, etc.<br> var followmouse = true;</p> <p>var dots = new Array();<br> init();</p> <p>function init()<br> {<br> var i = 0;<br> for (i = 0; i < nDots; i++) {<br> dots[i] = new dot(i);<br> }<br> <br> if (!isNetscape) {<br> // I only know how to read the locations of the <br> // <LI> items in IE<br> //skip this for now<br> // setInitPositions(dots)<br> }<br> <br> // set their positions<br> for (i = 0; i < nDots; i++) {<br> dots[i].obj.left = dots[i].X;<br> dots[i].obj.top = dots[i].Y;<br> }<br> <br> <br> if (isNetscape) {<br> // start right away since they are positioned<br> // at 0, 0<br> startanimate();<br> } else {<br> // let dots sit there for a few seconds<br> // since they're hiding on the real bullets<br> setTimeout("startanimate()", 2000);<br> }<br> }</p> <p></p> <p>function dot(i) <br> {<br> this.X = Xpos;<br> this.Y = Ypos;<br> this.dx = 0;<br> this.dy = 0;<br> if (isNetscape) { <br> this.obj = eval("document.dot" + i);<br> } else {<br> this.obj = eval("dot" + i + ".style");<br> }<br> }</p> <p><br> function startanimate() { <br> setInterval("animate()", 20);<br> }</p> <p><br> // This is to line up the bullets with actual LI tags on the page<br> // Had to add -DOTSIZE to X and 2*DOTSIZE to Y for IE 5, not sure why<br> // Still doesn't work great<br> function setInitPositions(dots)<br> {<br> // initialize dot positions to be on top <br> // of the bullets in the <ul><br> var startloc = document.all.tags("LI");<br> var i = 0;<br> for (i = 0; i < startloc.length && i < (nDots - 1); i++) {<br> dots[i+1].X = startloc[i].offsetLeft<br> startloc[i].offsetParent.offsetLeft - DOTSIZE;<br> dots[i+1].Y = startloc[i].offsetTop +<br> startloc[i].offsetParent.offsetTop + 2*DOTSIZE;<br> }<br> // put 0th dot above 1st (it is hidden)<br> dots[0].X = dots[1].X;<br> dots[0].Y = dots[1].Y - SEGLEN;<br> }</p> <p>// just save mouse position for animate() to use<br> function MoveHandler(e)<br> {<br> Xpos = e.pageX;<br> Ypos = e.pageY; <br> return true;<br> }</p> <p>// just save mouse position for animate() to use<br> function MoveHandlerIE() {<br> Xpos = window.event.x + document.body.scrollLeft;<br> Ypos = window.event.y + document.body.scrollTop; <br> }</p> <p>if (isNetscape) {<br> document.captureEvents(Event.MOUSEMOVE);<br> document.onMouseMove = MoveHandler;<br> } else {<br> document.onmousemove = MoveHandlerIE;<br> }</p> <p><br> function vec(X, Y)<br> {<br> this.X = X;<br> this.Y = Y;<br> }</p> <p>// adds force in X and Y to spring for dot[i] on dot[j]<br> function springForce(i, j, spring)<br> {<br> var dx = (dots[i].X - dots[j].X);<br> var dy = (dots[i].Y - dots[j].Y);<br> var len = Math.sqrt(dx*dx + dy*dy);<br> if (len > SEGLEN) {<br> var springF = SPRINGK * (len - SEGLEN);<br> spring.X += (dx / len) * springF;<br> spring.Y += (dy / len) * springF;<br> }<br> }</p> <p><br> function animate() { <br> // dots[0] follows the mouse,<br> // though no dot is drawn there<br> var start = 0;<br> if (followmouse) {<br> dots[0].X = Xpos;<br> dots[0].Y = Ypos; <br> start = 1;<br> }<br> <br> for (i = start ; i < nDots; i++ ) {<br> <br> var spring = new vec(0, 0);<br> if (i > 0) {<br> springForce(i-1, i, spring);<br> }<br> if (i < (nDots - 1)) {<br> springForce(i+1, i, spring);<br> }<br> <br> // air resisitance/friction<br> var resist = new vec(-dots[i].dx * RESISTANCE,<br> -dots[i].dy * RESISTANCE);<br> <br> // compute new accel, including gravity<br> var accel = new vec((spring.X + resist.X)/ MASS,<br> (spring.Y + resist.Y)/ MASS + GRAVITY);<br> <br> // compute new velocity<br> dots[i].dx += (DELTAT * accel.X);<br> dots[i].dy += (DELTAT * accel.Y);<br> <br> // stop dead so it doesn't jitter when nearly still<br> if (Math.abs(dots[i].dx) < STOPVEL &&<br> Math.abs(dots[i].dy) < STOPVEL &&<br> Math.abs(accel.X) < STOPACC &&<br> Math.abs(accel.Y) < STOPACC) {<br> dots[i].dx = 0;<br> dots[i].dy = 0;<br> }<br> <br> // move to new position<br> dots[i].X += dots[i].dx;<br> dots[i].Y += dots[i].dy;<br> <br> // get size of window<br> var height, width;<br> if (isNetscape) {<br> height = window.innerHeight + document.scrollTop;<br> width = window.innerWidth + document.scrollLeft;<br> } else { <br> height = document.body.clientHeight + document.body.scrollTop;<br> width = document.body.clientWidth + document.body.scrollLeft;<br> }<br> <br> // bounce of 3 walls (leave ceiling open)<br> if (dots[i].Y >= height - DOTSIZE - 1) {<br> if (dots[i].dy > 0) {<br> dots[i].dy = BOUNCE * -dots[i].dy;<br> }<br> dots[i].Y = height - DOTSIZE - 1;<br> }<br> if (dots[i].X >= width - DOTSIZE) {<br> if (dots[i].dx > 0) {<br> dots[i].dx = BOUNCE * -dots[i].dx;<br> }<br> dots[i].X = width - DOTSIZE - 1;<br> }<br> if (dots[i].X < 0) {<br> if (dots[i].dx < 0) {<br> dots[i].dx = BOUNCE * -dots[i].dx;<br> }<br> dots[i].X = 0;<br> }<br> <br> // move img to new position<br> dots[i].obj.left = dots[i].X; <br> dots[i].obj.top = dots[i].Y; <br> }<br> }</p> <p>// end code hiding --><br> </SCRIPT><br> </p> <br> <br> 2.请按Script内的指示按你的需要修改，我已把重点部分翻译了。还有不明白的地方请到论坛发表。</td> </tr> </table> </TD> <TD><IMG src="../images/space.gif" width=11 height="1"></TD> </TR></TABLE><!-- #EndEditable --><TABLE cellSpacing=0 cellPadding=0 width="100%" border=0> <TR bgColor=#ffffff> <TD><IMG src="../images/sq_3.gif" width=11 height="14"></TD> <TD width="100%"></TD> <TD><IMG src="../images/sq_4.gif" width=11 height="14"></TD> </TR></TABLE></BODY><!-- #EndTemplate --></HTML>⌨️ 快捷键说明
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