very short version: [html] 复制代码 代码如下: $('#myDiv').css({top:'50%',left:'50%',margin:'-'+($('#myDiv').height() / 2)+'px 0 0 -'+($('#myDiv').width() / 2)+'px'}); $('#myDiv').css({top:'50%',left:'50%',margin:'-'+($('#myDiv').height() / 2)+'px 0 0 -'+($('#myDiv').width() / 2)+'px'}); short version: [html] 复制代码 代码如下: (function($){ $.fn.extend({ center: function () { return this.each(function() { var top = ($(window).height() - $(this).outerHeight()) / 2; var left = ($(window).width() - $(this).outerWidth()) / 2; $(this).css({position:'absolute', margin:0, top: (top > 0 ? top : 0)+'px', left: (left > 0 ? left : 0)+'px'}); }); } }); })(jQuery); (function($){ $.fn.extend({ center: function () { return this.each(function() { var top = ($(window).height() - $(this).outerHeight()) / 2; var left = ($(window).width() - $(this).outerWidth()) / 2; $(this).css({position:'absolute', margin:0, top: (top > 0 ? top : 0)+'px', left: (left > 0 ? left : 0)+'px'}); }); } }); })(jQuery); Activated by this code : 复制代码 代码如下: $('#mainDiv').center(); [javascript] 复制代码 代码如下: (function($){ $.fn.extend({ center: function (options) { var options = $.extend({ // Default values inside:window, // element, center into window transition: 0, // millisecond, transition time minX:0, // pixel, minimum left element value minY:0, // pixel, minimum top element value withScrolling:true, // booleen, take care of the scrollbar (scrollTop) vertical:true, // booleen, center vertical horizontal:true // booleen, center horizontal }, options); return this.each(function() { var props = {position:'absolute'}; if (options.vertical) { var top = ($(options.inside).height() - $(this).outerHeight()) / 2; if (options.withScrolling) top += $(options.inside).scrollTop() || 0; top = (top > options.minY ? top : options.minY); $.extend(props, {top: top+'px'}); } if (options.horizontal) { var left = ($(options.inside).width() - $(this).outerWidth()) / 2; if (options.withScrolling) left += $(options.inside).scrollLeft() || 0; left = (left > options.minX ? left : options.minX); $.extend(props, {left: left+'px'}); } if (options.transition > 0) $(this).animate(props, options.transition); else $(this).css(props); return $(this); }); } }); })(jQuery); [code] (function($){ $.fn.extend({ center: function (options) { var options = $.extend({ // Default values inside:window, // element, center into window transition: 0, // millisecond, transition time minX:0, // pixel, minimum left element value minY:0, // pixel, minimum top element value withScrolling:true, // booleen, take care of the scrollbar (scrollTop) vertical:true, // booleen, center vertical horizontal:true // booleen, center horizontal }, options); return this.each(function() { var props = {position:'absolute'}; if (options.vertical) { var top = ($(options.inside).height() - $(this).outerHeight()) / 2; if (options.withScrolling) top += $(options.inside).scrollTop() || 0; top = (top > options.minY ? top : options.minY); $.extend(props, {top: top+'px'}); } if (options.horizontal) { var left = ($(options.inside).width() - $(this).outerWidth()) / 2; if (options.withScrolling) left += $(options.inside).scrollLeft() || 0; left = (left > options.minX ? left : options.minX); $.extend(props, {left: left+'px'}); } if (options.transition > 0) $(this).animate(props, options.transition); else $(this).css(props); return $(this); }); } }); })(jQuery); PLUGIN VERSION [javascript] 复制代码 代码如下: (function($){ $.fn.extend({ center: function (options) { var options = $.extend({ // Default values inside:window, // element, center into window transition: 0, // millisecond, transition time minX:0, // pixel, minimum left element value minY:0, // pixel, minimum top element value withScrolling:true, // booleen, take care of the scrollbar (scrollTop) vertical:true, // booleen, center vertical horizontal:true // booleen, center horizontal }, options); return this.each(function() { var props = {position:'absolute'}; if (options.vertical) { var top = ($(options.inside).height() - $(this).outerHeight()) / 2; if (options.withScrolling) top += $(options.inside).scrollTop() || 0; top = (top > options.minY ? top : options.minY); $.extend(props, {top: top+'px'}); } if (options.horizontal) { var left = ($(options.inside).width() - $(this).outerWidth()) / 2; if (options.withScrolling) left += $(options.inside).scrollLeft() || 0; left = (left > options.minX ? left : options.minX); $.extend(props, {left: left+'px'}); } if (options.transition > 0) $(this).animate(props, options.transition); else $(this).css(props); return $(this); }); } }); })(jQuery); 复制代码 代码如下: (function($){ $.fn.extend({ center: function (options) { var options = $.extend({ // Default values inside:window, // element, center into window transition: 0, // millisecond, transition time minX:0, // pixel, minimum left element value minY:0, // pixel, minimum top element value withScrolling:true, // booleen, take care of the scrollbar (scrollTop) vertical:true, // booleen, center vertical horizontal:true // booleen, center horizontal }, options); return this.each(function() { var props = {position:'absolute'}; if (options.vertical) { var top = ($(options.inside).height() - $(this).outerHeight()) / 2; if (options.withScrolling) top += $(options.inside).scrollTop() || 0; top = (top > options.minY ? top : options.minY); $.extend(props, {top: top+'px'}); } if (options.horizontal) { var left = ($(options.inside).width() - $(this).outerWidth()) / 2; if (options.withScrolling) left += $(options.inside).scrollLeft() || 0; left = (left > options.minX ? left : options.minX); $.extend(props, {left: left+'px'}); } if (options.transition > 0) $(this).animate(props, options.transition); else $(this).css(props); return $(this); }); } }); })(jQuery); Activated by this code : 复制代码 代码如下: $(document).ready(function(){ $('#mainDiv').center(); $(window).bind('resize', function() { $('#mainDiv').center({transition:300}); }); ); 观此人JS代码，让人叹为观止。 简洁明了。却又举一反三。

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