How to convert HTMLCollection, NodeList, and pseudo arrays into arrays _ javascript skills

Convert the HTMLCollectionNodeList pseudo array to an array. For more information, see. Here, objects that meet the following conditions are called pseudo arrays.
1, with the length attribute
2. Data Storage by index
3. methods such as push and pop with no Array

For example
1. arguments in the function.
2. Use document. forms, Form. elements, Select. options, document. getElementsByName (), document. collection (HTMLCollection, NodeList) obtained by getElementsByTagName () and childNodes/children.
3. Special writing objects, such

The Code is as follows:

Var obj = {};
Obj [0] = "1 ";
Obj [1] = "2 ";
Obj [2] = "3 ";
Obj. length = 3;

They do not have arrays such as push, pop, shift, and join. Sometimes you need to convert these pseudo arrays into real arrays, so that you can use methods such as push and pop. The following is the tool function makeArray.

The Code is as follows:

Var makeArray = function (obj ){
Return Array. prototype. slice. call (obj, 0 );
}
Try {
Array.prototype.slice.call(document.doc umentElement. childNodes, 0) [0]. nodeType;
} Catch (e ){
MakeArray = function (obj ){
Var res = [];
For (var I = 0, len = obj. length; I Res. push (obj [I]);
}
Return res;
}
}

Test the above three pseudo Arrays:

The Code is as follows:

// Define a function fun. Use makeArray internally to convert its arguments into an array.
Function fun (){
Var ary = makeArray (arguments );
Alert (ary. constructor );
}
// Call
Fun (3, 5 );


// Assume that there are multiple paragraph elements on the page.
Var els = document. getElementsByTagName ("p ");
Var ary1 = makeArray (els );
Alert (ary1.constructor );


// Special js objects (such as jquery objects)
Var obj = {};
Obj [0] = "1 ";
Obj [1] = "2 ";
Obj [2] = "3 ";
Obj. length = 3;

Var ary2 = makeArray (obj );
Alert (ary2.constructor );