Console.log ();
When you use the Console.log () function, the following firebug must be opened, otherwise this function in the Firefox runtime is not valid and affect the normal program, if you open with IE, will be wrong.
The first argument can be a string that contains the formatted placeholder output, for example:
Console.log ("The%s jumped over%d tall buildings", animal, count);
format string type
%s string
%d, integral type
%i (no support for digital type)
%f floating-point type (no support for digital type)
%o Linked objects
console.log () usage
Copy Code code as follows:
<! DOCTYPE HTML PUBLIC "-//W3C//DTD XHTML 1.0 transitional//en" "Http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd ">
<meta http-equiv= "Content-type" content= "text/html; Charset=utf-8 "/>
Console.log () Usage of <title>javascript </title>
<script type= "Text/javascript" >
/*
Console.log originally is Firefox "patent", strictly speaking is installed after the firebugs of Firefox unique debugging "trick".
This recruit, IE8 learned, but with more than firebugs trouble, only in the Open Debugging window (F12), console.log can produce results, or the error.
See Opera today also has a call Dragonfly Dongdong, use this thing to view DOM, already can compare with Firebug, however still can't use Console.log. So someone has provided this two-sentence code:
Window.console = Window.console | | {};
Console.log | | (Console.log = Opera.posterror);
After testing, the above code works.
At this point, Firefox/ie/opera can use the Console.log.
Of course, IE and Opera under the Console.log than firebugs original Console.log, or too simple, such as parameter is Object or array has no further display function.
*/
Variable
var i = ' I am a string ';
Console.log (' variable: ', i);
Array
var arr = [1,2,3,4,5];
Console.log (' array: ', arr);
Object
var obj1 = {
Key1: ' value1 ',
Key2: ' value2 ',
Key3: ' Value3 '
};
var obj2 = {
Key6: ' Value4 ',
Key5: ' Value5 ',
Key4: ' Value6 '
};
var obj3 = {
Key9: ' Value7 ',
Key8: ' Value8 ',
Key7: ' Value9 '
};
Console.log (' objects: ', obj1);
Array of objects
var objArr1 = [Obj1,obj2,obj3];
var objArr2 = [[Obj1],[obj2],[obj3]];
Console.log (' Object array 1: ', OBJARR1);
Console.log (' Object array 1: ', OBJARR2);
/*
Output:
Variable: I am a string
Arrays: [1, 2, 3, 4, 5]
Objects: Object {key1= "value1", key2= "value2", key3= "Value3"}
Object array 1:[object {key1= "value1", key2= "value2", key3= "Value3"}, Object {key6= "Value4", key5= "Value5", key4= "Value6"}, Object {key9= "Value7", key8= "Value8", key7= "Value9"}]
Object array 1:[[object {key1= "value1", key2= "value2", key3= "Value3"}], [object {key6= ' value4 ', key5= ' value5 ', key4= ' Value6 '}] , [Object {key9= "Value7", key8= "Value8", key7= "Value9"}]]
*/
</script>
<body>
</body>
