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      • JavaScript教程之if 語句

      • 2015-01-16 22:07 來源:未知
      if 語句(相關javascript教程)
      if ( <條件> ) <語句1> [ else <語句2> ];
      本語句有點象條件表達式“?:”:當<條件>為真時執行<語句1>,否則,如果 else 部分存在的話,就執行<語句2>。與“?:”不同的是,if 只是一條語句,不會返回數值。<條件>是布爾值,必須用小括號括起來;<語句1>和<語句2>都只能是一個語句,欲使用多條語句,請用語句塊。
      注意 請看下例:
      if (a == 1)
        if (b == 0) alert(a+b);
      else
        alert(a-b);
      本代碼企圖用縮進的方法說明 else 是對應 if (a == 1) 的,但是實際上,由于 else 與 if (b == 0) 最相近,本代碼不能按作者的想法運行。正確的代碼是
      if (a == 1) {
        if (b == 0) alert(a+b);
      } else {
        alert(a-b);
      }
      提示 一行代碼太長,或者涉及到比較復雜的嵌套,可以考慮用多行文本,如上例,if (a == 1) 后面沒有立即寫上語句,而是換一行再繼續寫。瀏覽器不會混淆的,當它們讀完一行,發現是一句未完成語句,它們會繼續往下讀。使用縮進也是很好的習慣,當一些語句與上面的一兩句語句有從屬關系時,使用縮進能使程序更易讀,方便程序員進行編寫或修改工作。

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