事实上,主要的 JavaScript 框架(比如 jQuery、Underscore 和 Prototype 等等)都有安全和通用的 for-each 功能实现。 在JSLint 的 for in 章节里面也提到,for in 语句允许循环遍历对象的属性名,但是也会遍历到那些通过原型链继承下来的属性,这在很多情况下都会造成预期以外的错误。有一种粗暴的解决办法: 代码语言:...
constarr=[1,2,3];arr.name="Hello world";letindex;for(indexinarr){console.log("arr["+index+"] = "+arr[index]);}// 输出结果如下:// arr[0] = 1// arr[1] = 2// arr[2] = 3// arr[name] = Hello world for-in 不仅仅遍历 array 自身的属性,其还遍历 array 原型链上的所有可...
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PHP foreach loop array I have a script where it's displaying user info on a leader board. It's grabbing each user's display info through the 'registrations' table as shown in the top sql, however their back-end info (userna... ...
JavaScript 循环 假如您需要运行代码多次,且每次使用不同的值,那么循环(loop)相当方便使用。 通常我们会遇到使用数组的例子: 不需要这样写: text += cars[0] + ""; text += cars[1] + "
UML was developed by Grady Booch, Ivar Jacobson, and James Rumbaugh (aka ‘The Three Amigos’) in the mid-90s. The initial versions of UML were created by integrating three of the leading object-oriented methods—namely,Booch,OMT, andOOSE—developed by UML’s founders, respectively. They als...
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UMLModel UnblockingStack Uncomment UncommentCode Underline Undo UndoCheckBoxList UndoCheckedOutItem Undock UndoNoColor UnfreezeColumn Ungroup UngroupClause Uninstall Union UnionInternal UnionPrivate UnionProtected UnionPublic UnionSealed UnionShortcut UniqueKey UniqueKeyError UniqueKeyWarning UnitePath UnitOfMeasure...
in UML268 Public functions, Queuing functions and209 Publish-Subscribe Pattern see Observer Pattern Purpose, for Harmony/ERT45 Push implementation64 Q QoS see Qualities of service QRSDetector6468 QTask insert() and209 Message and208 MessageQueue and209 remove() and209 Qualities of service (QoS)3 ...
This sample shows the UML Class Diagram of delivery system. On this diagram you can see the classes that are connected with aggregation and composition associations indicated with the multiplicity. This sample can be used by delivery services, postal ser