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  <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd"> <html> <head> <meta charset=gbk> <title>橢圓曲線</title> </head> <style> *{ margin:0px;padding:0px; } div{ border:1px solid #111; } .points{ width:1px;height:1px;border:0px solid #111; position:absolute; line-height:1px;font-size:1px; background:#111; } .go-oval{ width:10px;height:10px;border:0px solid #111; position:absolute; line-height:1px;font-size:1px; background:#111; border-radius:5px; } </style> <body> <div style="position:absolute;left:80px;top:30px;height:500px;width:500px;"> <div class="wmvwfqqt" id="tuoyuan1" style="height:500px;width:500px;"></div> <div class="wmvwfqqt" id="go-oval1" class="go-oval"></div> </div> <div style="position:absolute;left:800px;top:130px;height:500px;width:900px;"> <div class="wmvwfqqt" id="tuoyuan2" style="height:500px;width:900px;"></div> <div class="wmvwfqqt" id="go-oval2" class="go-oval"></div> </div> </body> </html> <script> (function(){ function $(idd){ var obj = {}; if( typeof( idd ) === 'string'){ var idName = idd.substr(1, idd.length ); //alert(idName) if( idd.substr(0,1) === '#' ){ obj = document.getElementById(idName); } else if( idd.substr(0,1) === '.'){ obj = document.getElementsByName(idName); //obj = obj.length ? document.getElementsByClassName(idName) : null; //alert(obj.length); //alert( obj[0].className ) } else if( idd == 'document' ){ obj = document; } else { obj = document.getElementsByTagName(idd); //alert(idd) } } else { obj = idd; } return obj; } //alert(document.body.clientWidth ) //生成橢圓曲線的點（數組） function make_points(a, b, interval, addX, addY){ var x,y; var xy = [],xy1 = [],xy2 = []; addX = addX ? addX : a; addY = addY ? addY : b; x = - Math.sqrt( (b*b)*a*a/(b*b) ); for(var n = 0; 1; n ++){ y = Math.sqrt( b*b - (b*b*x*x)/(a*a) ); if( n == 0 ){ y0 = y; } xy1[n] = [x + addX,y + addY]; //n++; xy2[n] = [x + addX,-y + addY]; x = x + interval; if( x > Math.sqrt( (b*b)*a*a/(b*b) ) ){ break; } } //xy2倒序 /* xy2 = xy2.sort(function(x,y){ return x == y ? 0 : (x > y ? -1 : 1); }); */ for(var n = 0, n2 = len = xy2.length - 1 ; n <= len; n ++, n2--){ xy[n] = xy2[n2]; } xy = xy1.concat(xy); return xy; } //畫橢圓曲線 function draw_oval(points){ var len = points.length; var divs = ''; for(var n = 0; n < len; n ++){ divs += '<div id="wmvwfqqt" class="points" style="left:'+ points[n][0] +'px;top:'+ points[n][1] +'px;"></div>'; } return divs; } //沿著曲線跑動 function go_oval(idd,points, n, t, addX, addY){ var len = points.length; n = n ? n : 0; t = t ? t : 10; addX = addX ? addX : 0; addY = addY ? addY : 0; var $obj = $(idd).style; $obj.left = points[n][0] + addX + 'px'; $obj.top = points[n][1] + addY + 'px'; n ++; n = n == len ? 0 : n; setTimeout(function(){ go_oval(idd, points, n, t, addX, addY); },t); } window.onload = function(){ var points1 = make_points(50,100,1,200,200); var points2 = make_points(200,100,1); //畫橢圓曲線 $('#tuoyuan1').innerHTML = draw_oval( points1 ); $('#tuoyuan2').innerHTML = draw_oval( points2 ); //alert( make_points(200,100,3) ) //小點在曲線上跑動 go_oval('#go-oval1',points1,0,10 ,-5,-5); go_oval('#go-oval2',points2,0,10 ,-5,-5); }; })(); </script>

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