在JavaConcurrencyinPractice的第65和66页，BrianGoetz列出了以下代码:@ThreadSafepublicclassDelegatingVehicleTracker{privatefinalConcurrentMaplocations;privatefinalMapunmodifiableMap;publicDelegatingVehicleTracker(Mappoints){locations=newConcurrentHashMap(points);unmodifiableMap=Collections.unmodifiableMap(locat

我是SQL的新手，需要帮助。我的SELECT语句中出现以下除零错误:SUM(Cast((replace(replace(replace(p.[TotalSales],'$',''),'(','-'),')',''))asmoney))-SUM(Cast((replace(replace(replace(p.[TotalCost],'$',''),'(','-'),')',''))asmoney))/SUM(Cast((replace(replace(replace(p.[TotalSales],'$',''),'(','-'),')',''))asmoney))asnew_bal我知道

当试图用jQuery显示一个div元素时，我得到了这个错误:[23:50:35.971]TypeError:p.easing[this.easing]isnotafunction@file:///D:/html5%20puzzle/jquery.js:2相关函数是这样的:functionshowWithAnimation(){console.log('animationcalled');$('#popup').show();$("#popup").css({"top":"30%","left":"30%"}).animate({top:(($(window).height()/2)-(