上次的文章引起很多網友的討論，我很高興。其中提到了不少我原來並不十分清楚的東西，在此首先對他們表示感謝，接下來繼續我的指令碼調試環境。
我們簡單的使用VS.NET開啟一個包含指令碼的html檔案，我們發現我們是不能調試它的，雖然我們可以按F9來設定一個端點，但是這個斷點卻是形同虛設:(。這是因為我們的browser還沒有進入可調試狀態，使用上一篇文章中的在代碼出錯時選擇Debugger的方法可以讓browser進入調試狀態，更普通的辦法是把Browser的線程附加到調試器上去。就是調試Test.html的樣本：
附加線程到運行Test.html的Browser進程上，就是Processes List裡的"IEXPLORE.EXE"。
這樣一來再在指令碼代碼上按F9設定斷點，斷點的狀態就會從的第一個unavailable狀態變為的第二個available狀態。
這樣一來我們的代碼執行到斷點處就會停止下來，這個好像廢話哈。下面就是VS.NET 2005比VS.NET 2003強的地方登場了。我們如果用過VS.NET編譯型程式的調試，都知道把滑鼠放在變數名上，會很快有個Tooltip顯示變數的值，或對象的類型和預設ToString()的值。這個功能在2003和2005裡同樣擁有，只是對於對象Object，在2003裡就顯示一個{...}，如果要看{...}是啥？需要使用Add Watch或QuickWatch來看；在whidbey裡面，這個察看功能有了很大的提升，我們將會看到一個可展開的節點來顯示對象的值，我們可以在快顯視窗裡瀏覽整個對象樹，如：
這個東西看起來是不是對調試非常方便呢？當然要是我們覺得快顯視窗太大遮擋了代碼，而且這時我們又瀏覽了很多幾級對象樹了，螢幕上有一大堆展開的快顯視窗，我們不希望它們消失後，看清了代碼又再把它們重新弄出來，怎麼辦呢？我們這時可以按Ctrl鍵或者滑鼠中鍵(就是滾輪)讓這些快顯視窗透明化~~~
很酷很貼心的功能吧？
調試指令碼中可能遇到的問題和對策(我們都預設IE的允許指令碼調試的選項是開啟的)：
1、本來我們開啟IE的指令碼調試後，程式出現指令碼錯誤時就會彈出一個MsgBox來提示是否調試，而不只是在IE左下角顯示一個warning icon。但是有的時候經過長時間的調試，IE在指令碼錯誤的時候，會不再彈出那個調試提示框，而是又變為在左下角顯示錯誤表徵圖。解決這個問題很簡單，關掉browser重新開啟來調試就好了。
2、在指令碼正常運行時，我們使用IE的View->Script Debugger的Open和Break at Next Statement選項會強行調出指令碼調試器選擇視窗。但是如果我們在指令碼中開啟過popup視窗，這兩個調試選項會失效，就是點選後沒有任何反應，這個可能是IE的bug，解決辦法一：重新起動IE來調試；解決辦法二：在希望調試的指令碼語句前寫一個錯誤的指令碼調用，比如a.a;，這樣程式運行在a.a語句時就會被break並彈出錯誤調試提示MsgBox，我們可以在這時選擇調試器，進入調試狀態後使用滑鼠改變指令碼執行順序，跳過錯誤的語句就行了。
關於指令碼調試環境先寫到這裡，以後有更好的調試方法我會更新進來，歡迎大家提出更好的指令碼調試意見和建議。
The End.
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