$(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();
 }
 });


});

本插件可能要修改的地方

1.遮罩层的id,mask可能和你的某些元素冲突，建议换成其它的

2.遮罩层的z-index可能不够大，当你拖动停不下来的时候，把z-index提高，最大值为21474837