任意表格实现改变列大小的实例教程

$(function () {var isMouseDown = false;var currentTh = null;
   $('table th').bind({
       mousedown:function (e) {           var $th = $(this);           var left = $th.offset().left; //元素距左   var rightPos = left + $th.outerWidth();           if (rightPos-4<= e.pageX && e.pageX <= rightPos) {
               isMouseDown = true;
               currentTh = $th;
               $('table th').css('cursor','e-resize');               //创建遮罩层，防止mouseup事件被其它元素阻止冒泡，导致mouseup事件无法被body捕获，导致拖动不能停止   var bodyWidth = $('body').width();               var bodyHeight = $('body').height();
               $('body').append('<div id="mask" style="opacity:0;top:0px;left:0px;cursor:e-resize;background-color:green;position:absolute;z-index:9999;width:'+bodyWidth+'px;height:'+bodyHeight+'px;"></div>');
           }
       }
       
   });

   $('body').bind({
       mousemove:function(e) {           //移动到column右边缘提示   $('table th').each(function (index,eleDom) {               var ele = $(eleDom);               var left = ele.offset().left; //元素距左   var rightPos = left + ele.outerWidth();               if (rightPos-4<= e.pageX && e.pageX <= rightPos) { //移到列右边缘   ele.css('cursor','e-resize');
               }else{                   if(!isMouseDown){ //不是鼠标按下的时候取消特殊鼠标样式   ele.css("cursor","auto");
                   }
               }
           });           //改变大小   if(currentTh != null){               if(isMouseDown){ //鼠标按下了，开始移动   var left = currentTh.offset().left;                   var paddingBorderLen = currentTh.outerWidth()-currentTh.width();
                   currentTh.width((e.pageX-left-paddingBorderLen)+'px');
               }
           }
       },
       mouseup:function (e) {
           isMouseDown = false;
           currentTh = null;
           $('table th').css('cursor','auto');
           $('#mask').remove();
       }
   });


});