绑定事件(addEvent)和精确获取样式(getStyle)

//绑定事件 var addEvent = document.addEventListener ? function(el,type,callback){ el.addEventListener( type, callback, !1 ); } : function(el,type,callback){ el.attachEvent( "on" + type, callback ); } //精确获取样式 var getStyle = document.defaultView ? function(el,style){ return document.defaultView.getComputedStyle(el, null).getPropertyValue(style) } : function(el,style){ style = style.replace(/-(w)/g, function($, $1){ return $1.toUpperCase(); }); return el.currentStyle[style]; }