jquery Array Processing method Rollup _jquery

$.each (Array, [callback]) traversal, very common

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var arr = [' JavaScript ', ' php ', ' Java ', ' C + + ', ' C # ', ' Perl ', ' VB ', ' HTML ', ' CSS ', ' objective-c '];
$.each (arr, function (key, Val) {
Firebug Console
Console.log (' Index in arr: ' + key + ", corresponding value:" + val);
If you want to exit the loop
return false;
});

$.grep (Array, callback, [invert]) filter, commonly used

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var temp = [];
temp = $.grep (arr, function (val, key) {
if (Val.indexof (' C ')!=-1)
return true;
If the [invert] parameter is not given or false, $.grep collects only the array elements that return true for the callback function
If the [invert] argument is true, the array element that collects the callback function returns false $.grep
}, False);
Console.dir (temp);

$.map (Array, [callback]) not used too much

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Versions prior to 1.6 only support arrays
temp = $.map (arr, function (val, key) {
Returns NULL, the array length returned is minus 1
if (val = = ' vb ') return null;
return Val;
});
Console.dir (temp);
1.6 Starting to support JSON-formatted object
var obj = {key1: ' Val1 ', Key2: ' Val2 ', Key3: ' Val3 '};
temp = $.map (obj, function (val, key) {
return Val;
});
Console.dir (temp);

$.inarray (val, array) determines whether the specified array is used in the

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Returns the position of the element in the array, 0 is the starting position, and return-1 does not find the element
Console.log ($.inarray (' JavaScript ', arr));

$.merge (first, second) merges two arrays, using frequencies generally

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var frontend = [' JavaScript ', ' CSS ', ' html '],
backend = [' java ', ' php ', ' C + + '];
This way modifies the first argument, the frontend array
temp = $.merge (frontend, backend);
Console.dir (temp);
Console.dir (frontend);
You can use the following methods to avoid the effect on the original array
$.merge ($.merge ([], frontend), backend);

$.unique (array) filters repeating elements in an array, not used

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<DIV>blahblahblah....</DIV>
<DIV></DIV>
<div class=dup></div>
<div class=dup></div>
<div class=dup></div>
<DIV></DIV>
$.unique supports only DOM element arrays, eliminates duplicate DOM elements, and does not support other types of arrays (string or number)
Get the original Dom array, not the jquery encapsulated
var divs = $ (' div '). get ();
Add a few class div for DUP
DIVs = Divs.concat ($ (' div.dup '). get ());
Console.log ("before unique:" + divs.length);
DIVs = $.unique (divs);
Console.log ("After unique:" + divs.length);

$.makearray (obj) converts class array objects into groups, infrequently

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First, what is a class array object? The jquery official web site uses divs = Getelementsbytag (' div ') for example
This divs has some sort of array-like length, get the element through [index], etc.
Then using $.makearray (divs) to make it into an array, you can use the other features of the array
such as reverse (), pop (), etc.

$ (DOM). ToArray () Restores the jquery collection to an array of DOM, not used

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Like Makearray, quite infrequently, the general situation can be ignored
This article refers to Mr.think's blog, here thanks for sharing