ExtJS in IE8 under Tips 'xtype' is null or not an object

Using ExtJS 4.0, in google browser and Firefox browsers calls no problem, but when prompted to open in IE8:

line: 15364
Error: 'xtype' is null or not an object

trace found documents: ext-all-debug.js errors, ask whether IE8 compatibility problems?


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should not be such a problem, is not it, when you configure more than one json object behind the comma? firefox can not go wrong, IE8-down to be wrong

If var o = {showbo: 'http://www.coding123.net',}

Such data is no problem in firefox, IE down on the error
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was my fault, js code to use the parent as a variable name, this is the keywords within IE, change a name on the line.
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But do pop up box, or will be error in IE, depressed!
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you check what xtype in what places to see if there are problems
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Le me go. Google Firefox browser items [] plus the last one, not an error. . IE will go wrong. . Sometimes a page thousands of rows. . Accidentally get one more, looking for half a day. . Hey
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I have encountered this problem