ï»?!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> 软äšg开发原åˆ?‹¹Žå—软äšg开发|å±×ƒ¸œè½¯äšg开å?‹¹Žå—èµ¢å¯d¿U‘技软äšg开发公å?/title> <meta name="keywords" content="软äšg开发原åˆ?/> <meta name="description" content="重复代码的äñ”生由各种各样的原因,¾lå¸¸çœ‹åˆ°½E‹åºå‘˜æŠŠå‡ è¡Œæˆ–一整段代码从这里复制到˜q™é‡ŒåQŒç„¶åŽç¨åŠ ä¿®æ”¹ï¼Œž®±å˜æˆäº†ä¸€ä»½æ–°çš„代码。这里的原因是程序员可以通过极少的努力就完成代码重用åQŒä½†æ˜¯æˆ‘们可以来看看软äšg开发原则:1ã€?/> <link href="/css/style.css" rel="stylesheet" type="text/css" /> <meta http-equiv="Cache-Control" content="no-transform" /> <meta http-equiv="Cache-Control" content="no-siteapp" /> </head> <body> <div style="position:fixed;left:-9000px;top:-9000px;"><dfn id="orz4q"><noscript id="orz4q"><xmp id="orz4q"><output id="orz4q"></output></xmp></noscript></dfn><strong id="orz4q"><dl id="orz4q"></dl></strong><ol id="orz4q"><p id="orz4q"><nav id="orz4q"><pre id="orz4q"></pre></nav></p></ol><dfn id="orz4q"></dfn><small id="orz4q"><optgroup 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<div class="youshi_f1" id="youshi_tdyx"> <div class="youshi01"> <h1 class="article_title">软äšg开发原åˆ?/h1> <div class="article_author">æ·ÕdŠ æ—‰™—´åQ?016-12-21 10:20:07 文章作者:<a href="/">‹¹Žå—软äšg开å?/a> ‹¹è§ˆ‹Æ¡æ•°åQ?Script Language="Javascript" Src="/item/GetHits.asp?Action=Count&GetFlag=0&m=1&ID=3138"></Script></div> <div class="article_main"><div id="MyContent"><p style="margin-top: 0px; margin-bottom: 0px; padding: 15px 0px 0px; line-height: 30px; font-family: 宋体;">重复代码的äñ”生由各种各样的原因,¾lå¸¸çœ‹åˆ°½E‹åºå‘˜æŠŠå‡ è¡Œæˆ–一整段代码从这里复制到˜q™é‡ŒåQŒç„¶åŽç¨åŠ ä¿®æ”¹ï¼Œž®±å˜æˆäº†ä¸€ä»½æ–°çš„代码。这里的原因是程序员可以通过极少的努力就完成代码重用åQŒä½†æ˜¯æˆ‘们可以来看看软äšg开发原则:<br style="margin: 0px; padding: 0px;"/>1、存在的理由<br style="margin: 0px; padding: 0px;"/>    ä¸€ä¸ªèÊY件系¾lŸå­˜åœ¨çš„理由ž®±æ˜¯åQšäؓ它的用户提供价倹{€‚你所有的军_®šéƒ½å–决于˜q™ä¸€ç‚V€‚在指定一个系¾lŸéœ€æ±‚,在写下一ŒD늳»¾lŸåŠŸèƒ½ï¼Œåœ¨å†³å®šç¡¬ä»¶åã^台和开发过½E‹ä¹‹å‰ï¼Œé—®ä½ è‡ªå·±ä¸€ä¸ªé—®é¢˜ï¼Œâ€œè¿™æ ·åšä¼šäؓ¾pȝ»Ÿå¢žåŠ ä»·å€¼å—åQŸâ€œï¼Œå¦‚æžœ½{”案是”yes”,那就做。如果是”Noâ€?那就不做。这个原则是其他原则的原则ã€?nbsp;<br style="margin: 0px; padding: 0px;"/>2、能½Ž€å•å°±½Ž€å?br style="margin: 0px; padding: 0px;"/>软äšg设计不是一个轻描æÙE写的˜q‡ç¨‹ã€‚在做ä“Q何一个设计时åQŒä½ å¿…须考虑很多因素。所有设计应当尽可能½Ž€å•ï¼Œä½†æ˜¯ä¸è¦å†æ¯”˜q™ç®€å•äº†ã€‚这样äñ”生的¾pȝ»Ÿæ‰æ˜¯å¯ä»¥ç†è§£å’Œå®¹æ˜“维护的。这òq¶ä¸æ˜¯è¯´å¾ˆå¤šç”±æ„ä¹‰çš„ç‰ÒŽ€§ï¼Œå› äؓ˜q™ç§½Ž€å•æ€§ä¹Ÿè¦è¢«æŠ›å¼ƒã€‚事实上åQŒç®€å•æ˜¯é€šè¿‡è®¸å¤šæ€è€ƒå’Œä¸€‹Æ¡ä¸€‹Æ¡çš„反复修改才达到的。这些努力的汇报ž®±æ˜¯æ›´å®¹æ˜“维护,代码错误更少ã€?br style="margin: 0px; padding: 0px;"/>3、保持远è§?br style="margin: 0px; padding: 0px;"/>    æ¸…晰的远见是一个èÊY仉™¡¹ç›®æˆåŠŸçš„基础。没有这æ ïLš„˜qœè§åQŒé¡¹ç›®å¼€å‘最后就变成天天ä¸ÞZ¸€ä¸ªä¸å¥½çš„设计做补丁。概å¿ëŠš„完整性是¾pȝ»Ÿè®¾è®¡ä¸­æœ€é‡è¦çš„问题。只有当你对¾pȝ»Ÿçš„体¾pȝ”±ä¸€ä¸ªæ¸…晰的感觉åQŒæ‰å¯èƒ½åŽÕd‘现通用的抽象和机制。开发这¿Ué€šç”¨æ€§æœ€¾lˆå¯¼è‡´ç³»¾lŸæ›´½Ž€å•ï¼Œå› æ­¤æ›´å°åQŒæ›´å¯é ã€‚如果你不断地复制、粘贴、修改代码,最¾lˆä½ ž®†é™·å…¥ä¸€ä¸ªå¤§æ³¥æ½­åQŒä½ æ°¸è¿œä¸å¯èƒ½å¯¹¾pȝ»Ÿæœ‰ä¸€ä¸ªæ¸…晰的认识ã€?nbsp;<br style="margin: 0px; padding: 0px;"/>4、你刉™€ çš„åQŒåˆ«äºÞZ¼šæ¶ˆè´¹<br style="margin: 0px; padding: 0px;"/>    è½¯äšg¾pȝ»Ÿä¸æ˜¯åœ¨çœŸ½IÞZ¸­ä½¿ç”¨çš„。其他äh会ä‹É用、维护、文档你的系¾lŸã€‚这依赖于对你系¾lŸçš„理解。所以,你设计、实现的东西应当能够让别人理解。要è®îC½åQŒä½ å†™çš„代码òq‰™žåªç»™è®¡ç®—机看åQŒä½ è¦æ—¶æ—¶è®°ä½ï¼Œä»£ç ˜q˜è¦¾l™äh看ã€?br style="margin: 0px; padding: 0px;"/>    å¦‚果到处泛滥似是而非的代码,别äh如何能够辨别˜q™äº›ä»£ç çš„相似和不同åQŒå¦‚何去理解˜q™äº›ä»£ç ä¹‹é—´å…ähœ‰ä½•ç§å…³ç³»ã€?nbsp;<br style="margin: 0px; padding: 0px;"/>5、对ž®†æ¥å¼€æ”?br style="margin: 0px; padding: 0px;"/>    ä¸€ä¸ªæˆåŠŸçš„软äšg有很长的生命期。你必须能够使得软äšg能够适应˜q™æ ·å’Œé‚£æ ïLš„变化。所以,一开始就不要软äšg设计到死角上厅R€‚这个问题,你要考虑到各¿Uå„æ ïLš„可能性,而不光光是图省事。复åˆÓž¼Œ¾_˜è„“一下即可ã€?nbsp;<br style="margin: 0px; padding: 0px;"/>6、äؓ重用做好计划 <br style="margin: 0px; padding: 0px;"/>    è½¯äšg模式是重用计划的一¿Uã€‚不断重复的代码昄¡„¶ä¸æ˜¯˜q™æ ·çš„计划ã€?nbsp;<br style="margin: 0px; padding: 0px;"/>7、思è€?nbsp;<br style="margin: 0px; padding: 0px;"/>    åœ¨é‡‡å–ä“Q何动作之前首先做一个清晰、完整的考虑åQŒè¿™æ äh‰èƒ½äñ”生更好的¾l“果。如果你考虑了,但还是äñ”生错误的¾l“æžœåQŒé‚£ä¹ˆè¿™¿UåŠªåŠ›ä¹Ÿæ˜¯å€¼å¾—的。在你学习或研究¾cÖM¼¼çš„问题时åQŒæ›´å®ÒŽ˜“理解和掌握ã€?nbsp;<br style="margin: 0px; padding: 0px;"/>    ˜q™äº›åŽŸåˆ™å‘Šè¯‰æˆ‘们è½ÀL¾åœ°å¤åˆ¶ã€ç²˜è´´å’Œä¿®æ”¹ä»£ç ä¸å¯èƒ½äñ”生好的,也就是容易理解、维护、重用的代码。但请不要走极端ã€?nbsp;<br style="margin: 0px; padding: 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