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| #fade { | |
| width: 100px; | |
| height: 100px; | |
| border-radius: 50%; | |
| border: none; | |
| } |
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| <!DOCTYPE html> | |
| <html> | |
| <head> | |
| <meta charset=utf-8 /> | |
| <title>JS Bin</title> | |
| </head> | |
| <body> | |
| <button type="button" id='fade' onMouseOver="fadeEffect.init('fade', 0, 90)" onMouseOut="fadeEffect.init('fade', 0)"><p>Hello!</p></button> | |
| </body> | |
| </html> |
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| var fadeEffect=function(){ | |
| return{ | |
| init:function(id, flag, target){ | |
| this.elem = document.getElementById(id); | |
| clearInterval(this.elem.si); | |
| this.target = target ? target : flag ? 100 : 0; | |
| this.flag = flag || -1; | |
| this.alpha = this.elem.style.opacity ? parseFloat(this.elem.style.opacity) * 100 : 0; | |
| this.elem.si = setInterval(function(){fadeEffect.tween();}, 20); | |
| }, | |
| tween:function(){ | |
| if(this.alpha == this.target){ | |
| clearInterval(this.elem.si); | |
| }else{ | |
| var value = Math.round(this.alpha + ((this.target - this.alpha) * 0.05)) + (1 * this.flag); | |
| this.elem.style.opacity = value / 100; | |
| this.elem.style.filter = 'alpha(opacity=' + value + ')'; | |
| this.alpha = value; | |
| } | |
| } | |
| }; | |
| }(); |
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