//GoTop mg12
GoTop = function() {
this.config = {
pageWidth : 960,//页面宽度
nodeId : 'go-top',//回到顶部按钮的ID
nodeWidth : 50,//按钮宽度
distanceToBottom : 120,//距离底部高度
hideRegionHeight : 90,//消失高度
text : ''
};
this.cache = {
topLinkThread : null
}
};
GoTop.prototype = {
init : function(config) {
this.config = config || this.config;
var _self = this;
jQuery(window).scroll(function() {
_self._scrollScreen({
_self : _self
});
});
jQuery(window).resize(function() {
_self._resizeWindow({
_self : _self
});
});
_self._insertNode({
_self : _self
});
},
_insertNode : function(args) {
var _self = args._self;
var topLink = jQuery('' + _self.config.text + '');
topLink.appendTo(jQuery('body'));
if(jQuery.scrollTo) {
topLink.click(function() {
jQuery.scrollTo({
top : 0
}, 400);
return false;
});
}
var right = _self._getDistanceToBottom({
_self : _self
});
if(/MSIE 6/i.test(navigator.userAgent)) {
topLink.css({
'display' : 'none',
'position' : 'absolute',
'right' : right + 'px'
});
} else {
topLink.css({
'display' : 'none',
'position' : 'fixed',
'right' : right + 'px',
'top' : (jQuery(window).height() - _self.config.distanceToBottom) + 'px'
});
}
},
_scrollScreen : function(args) {
var _self = args._self;
var topLink = jQuery('#' + _self.config.nodeId);
if(jQuery(document).scrollTop() <= _self.config.hideRegionHeight) {
clearTimeout(_self.cache.topLinkThread);
topLink.hide();
return;
}
if(/MSIE 6/i.test(navigator.userAgent)) {
clearTimeout(_self.cache.topLinkThread);
topLink.hide();
_self.cache.topLinkThread = setTimeout(function() {
var top = jQuery(document).scrollTop() + jQuery(window).height() - _self.config.distanceToBottom;
topLink.css({
'top' : top + 'px'
}).fadeIn();
}, 400);
} else {
topLink.fadeIn();
}
},
_resizeWindow : function(args) {
var _self = args._self;
var topLink = jQuery('#' + _self.config.nodeId);
var right = _self._getDistanceToBottom({
_self : _self
});
var top = jQuery(window).height() - _self.config.distanceToBottom;
if(/MSIE 6/i.test(navigator.userAgent)) {
top += jQuery(document).scrollTop();
}
topLink.css({
'right' : right + 'px',
'top' : top + 'px'
});
},
_getDistanceToBottom : function(args) {
var _self = args._self;
var right = parseInt((jQuery(window).width() - _self.config.pageWidth) / 2 - _self.config.nodeWidth - 20, 10);
if(right < 10) {
right = 10;
}
return right;
}
};
//GoTop mg12
GoTop = function() {
this.config = {
pageWidth : 960,//页面宽度
nodeId : 'go-top',//回到顶部按钮的ID
nodeWidth : 50,//按钮宽度
distanceToBottom : 120,//距离底部高度
hideRegionHeight : 90,//消失高度
text : ''
};
this.cache = {
topLinkThread : null
}
};
GoTop.prototype = {
init : function(config) {
this.config = config || this.config;
var _self = this;
jQuery(window).scroll(function() {
_self._scrollScreen({
_self : _self
});
});
jQuery(window).resize(function() {
_self._resizeWindow({
_self : _self
});
});
_self._insertNode({
_self : _self
});
},
_insertNode : function(args) {
var _self = args._self;
var topLink = jQuery('' + _self.config.text + '');
topLink.appendTo(jQuery('body'));
if(jQuery.scrollTo) {
topLink.click(function() {
jQuery.scrollTo({
top : 0
}, 400);
return false;
});
}
var right = _self._getDistanceToBottom({
_self : _self
});
if(/MSIE 6/i.test(navigator.userAgent)) {
topLink.css({
'display' : 'none',
'position' : 'absolute',
'right' : right + 'px'
});
} else {
topLink.css({
'display' : 'none',
'position' : 'fixed',
'right' : right + 'px',
'top' : (jQuery(window).height() - _self.config.distanceToBottom) + 'px'
});
}
},
_scrollScreen : function(args) {
var _self = args._self;
var topLink = jQuery('#' + _self.config.nodeId);
if(jQuery(document).scrollTop() <= _self.config.hideRegionHeight) {
clearTimeout(_self.cache.topLinkThread);
topLink.hide();
return;
}
if(/MSIE 6/i.test(navigator.userAgent)) {
clearTimeout(_self.cache.topLinkThread);
topLink.hide();
_self.cache.topLinkThread = setTimeout(function() {
var top = jQuery(document).scrollTop() + jQuery(window).height() - _self.config.distanceToBottom;
topLink.css({
'top' : top + 'px'
}).fadeIn();
}, 400);
} else {
topLink.fadeIn();
}
},
_resizeWindow : function(args) {
var _self = args._self;
var topLink = jQuery('#' + _self.config.nodeId);
var right = _self._getDistanceToBottom({
_self : _self
});
var top = jQuery(window).height() - _self.config.distanceToBottom;
if(/MSIE 6/i.test(navigator.userAgent)) {
top += jQuery(document).scrollTop();
}
topLink.css({
'right' : right + 'px',
'top' : top + 'px'
});
},
_getDistanceToBottom : function(args) {
var _self = args._self;
var right = parseInt((jQuery(window).width() - _self.config.pageWidth) / 2 - _self.config.nodeWidth - 20, 10);
if(right < 10) {
right = 10;
}
return right;
}
};
