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if ( ! NeuF ) var NeuF = { } ;
NeuF . ScrollPage = function ( obj , options , callback ) {
var _defaultOptions = { delay : 500 , marginBottom : 100 } ; //默认配置：
options = $ . extend ( _defaultOptions , options ) ;
this . isScrolling = false ; //是否在滚动
this . oriPos = 0 ; //原始位置
this . curPos = 0 ; //当前位置
var me = this ; //顶层
var $obj = ( typeof obj == "string" ) ? $ ( "#" + obj ) : $ ( obj ) ;
//绑定滚动事件
$obj . scroll ( function ( ev ) {
me . curPos = $obj . scrollTop ( ) ;
if ( $ ( window ) . height ( ) + $ ( window ) . scrollTop ( ) >= $ ( document . body ) . height ( ) - options . marginBottom ) {
if ( me . isScrolling == true ) return ;
me . isScrolling = true ;
setTimeout ( function ( ) { me . isScrolling = false ; } , options . delay ) ; //重复触发间隔毫秒
if ( typeof callback == "function" ) callback . call ( null , me . curPos - me . oriPos ) ;
} ;
me . oriPos = me . curPos ;
} ) ;
} ;