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Console. log was originally a "patent" of Firefox, and strictly said it was a "trick" for debugging unique to Firefox after Firebugs was installed ".
This trick is learned by IE8, but it is more difficult to use than Firebugs. The console. log can output the result only when the debugging window (F12) is enabled. Otherwise, an error is reported.
Today, we can see that Opera also has something called dragonfly. You can use this to view DOM, which is comparable to Firebug. However, you still cannot use console. log. So someone provides the following code:
Copy codeThe Code is as follows:
Window. console = window. console || {};
Console. log | (console. log = opera. postError );
After testing, the above Code can be used.
Now, Firefox, IE, and Opera can all use console. log.
Of course, the console. log in IE and Opera is much simpler than the original console. log in Firebugs. For example, if the parameter is an Object or an array, no further display function is available.
<! DOCTYPE html PUBLIC "-// W3C // dtd xhtml 1.0 Transitional // EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <ptml xmlns = "http://www.w3.org/1999/xhtml"> <pead> <meta http-equiv =" content-Type "content =" text/html; charset = UTF-8 "/> <title> javascript console. log () usage </title> </pead> <body> </ptml>
[Ctrl + A select all Note: If you need to introduce external Js, You need to refresh it to execute]
Note: by default, console. log is not supported in ie browser. Instead, it will be better to comment out all ie files because of this code error.
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