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      • JavaScript教程之循環體

      • 2015-01-16 22:29 來源:未知
      循環體(相關javascript教程)
      for (<變量>=<初始值>; <循環條件>; <變量累加方法>) <語句>;
      本語句的作用是重復執行<語句>,直到<循環條件>為 false 為止。它是這樣運作的:首先給<變量>賦<初始值>,然后*判斷<循環條件>(應該是一個關于<變量>的條件表達式)是否成立,如果成立就執行<語句>,然后按<變量累加方法>對<變量>作累加,回到“*”處重復,如果不成立就退出循環。這叫做“for循環”。下面看看例子。
      for (i = 1; i < 10; i++) document.write(i);
      本語句先給 i 賦初始值 1,然后執行 document.write(i)語句(作用是在文檔中寫 i 的值,請參越“對象化編程”一章);重復時 i++,也就是把 i 加 1;循環直到 i<10 不滿足,也就是 i>=10 時結束。結果是在文檔中輸出了“123456789”。
      和 if 語句一樣,<語句>只能是一行語句,如果想用多條語句,你需要用語句塊。
      與其他語言不同,JavaScript 的 for 循環沒有規定循環變量每次循環一定要加一或減一,<變量累加方法>可以是任意的賦值表達式,如 i+=3、i*=2、i-=j 等都成立。
      提示 適當的使用 for 循環,能使 HTML 文檔中大量的有規律重復的部分簡化,也就是用 for 循環重復寫一些 HTML 代碼,達到提高網頁下載速度的目的。不過請在 Netscape 中重復進行嚴格測試,保證通過了才好把網頁傳上去。作者曾試過多次因為用 for 循環向文檔重復寫 HTML 代碼而導致 Netscape“猝死”。IE 中絕對沒有這種事情發生,如果你的網也是只給 IE 看的,用多多的 for 也沒問題。
      除了 for 循環,JavaScript 還提供 while 循環
      while (<循環條件>) <語句>;
      比 for 循環簡單,while 循環的作用是當滿足<循環條件>時執行<語句>。while 循環的累加性質沒有 for 循環強。<語句>也只能是一條語句,但是一般情況下都使用語句塊,因為除了要重復執行某些語句之外,還需要一些能變動<循環條件>所涉及的變量的值的語句,否則一但踏入此循環,就會因為條件總是滿足而一直困在循環里面,不能出來。這種情況,我們習慣稱之為“死循環”。死循環會弄停當時正在運行的代碼、正在下載的文檔,和占用很大的內存,很可能造成死機,應該盡最大的努力避免。
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