console.log();
When you use the console.log() function, the following firebug must be opened, otherwise this function will be invalid and affect the normal program when running with firefox. If it is opened with IE, it will Something will go wrong.
The first parameter can be a string containing formatted placeholder output, for example:
console.log("The %s jumped over %d tall buildings" , animal, count);
Format string type
%s string
%d, integer
%i (numeric type is not supported yet)
%f float Point type (number type is not supported yet)
%o link object
console.log() usage
javascript console.log() usage</title> ; <BR><script type="text/javascript"> <br>/* <br>console.log was originally a "patent" of Firefox. Strictly speaking, it is a unique debugging feature of Firefox after installing Firebugs. Trick". <br>IE8 has learned this trick, but it is more troublesome to use than Firebugs. Console.log can only produce results when the debugging window (F12) is opened, otherwise an error will be reported. <br>Today I saw that Opera also has something called dragonfly. Using this tool to view the DOM is comparable to Firebug. However, console.log still cannot be used. So someone provided these two lines of code: <br>window.console = window.console || {}; <br>console.log || (console.log = opera.postError); <br>After testing, the above The code works. <br>At this point, Firefox/IE/Opera can all use console.log. <br>Of course, the console.log under IE and Opera is still too simple compared to the original console.log in Firebugs. For example, if the parameter is an Object or an array, there is no further display function. <br>*/ <br>//Variable<br>var i = 'I am a string'; <br>console.log('Variable:',i); <br>//Array<br>var arr = [1,2,3,4,5]; <br>console.log('array:',arr); <br>//Object<br>var obj1 = { <br>key1 : 'value1', <br>key2 : 'value2', <br>key3 : 'value3' <br>}; <br>var obj2 = { <br>key6 : 'value4', <br>key5 : 'value5', <br> key4 : 'value6' <br>}; <br>var obj3 = { <br>key9 : 'value7', <br>key8 : 'value8', <br>key7 : 'value9' <br>}; <br>console.log('Object:',obj1); <br>//Object array<br>var objArr1 = [obj1,obj2,obj3]; <br>var objArr2 = [[obj1],[obj2],[ obj3]]; <br>console.log('Object array 1:',objArr1); <br>console.log('Object array 1:',objArr2); <br>/* <br>Output: <br>Variable: I am a string <br>Array: [1, 2, 3, 4, 5] <br>Object: Object { key1="value1", key2="value2", key3="value3"} <br>Object array 1: [Object { key1="value1", key2="value2", key3="value3"}, Object { key6="value4", key5="value5", key4="value6"}, Object { key9="value7", key8="value8", key7="value9"}] <br>Object array 1: [[Object { key1="value1", key2="value2", key3="value3"}], [Object { key6="value4", key5="value5", key4="value6"}], [Object { key9="value7", key8="value8", key7="value9"}]] <br>* / <br></script> <br></head> <br><body> <br></body> <br></html> <br>
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