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| <!DOCTYPE html> | |
| <html> | |
| <head> | |
| <meta charset=utf-8 /> | |
| <title>JS Bin</title> | |
| <style> | |
| #box { | |
| background-color: #369; | |
| height: 100px; | |
| left: 50px; | |
| position: absolute; | |
| top: 50px; | |
| width: 100px; | |
| } | |
| </style> | |
| </head> | |
| <body> | |
| <div id="box"></div> | |
| <script> | |
| (function(){ | |
| var speed = 10, | |
| moveBox = function(moveBy) { | |
| var el = document.getElementById("box"), | |
| left = el.offsetLeft; | |
| if ( (moveBy > 0 && left > 399) || (moveBy < 0 && left < 51) ) { | |
| clearInterval(timer); | |
| timer = setInterval(function() { | |
| moveBox(moveBy * -1); | |
| }, speed); | |
| } | |
| el.style.left = left + moveBy + 'px'; | |
| }; | |
| var timer = setInterval(function(){ | |
| moveBox(2); | |
| }, speed); | |
| }()); | |
| </script> | |
| </body> | |
| </html> |
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