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This article introduces the relevant knowledge of "how to understand the histochemistry in javascript". In the operation of actual cases, many people will encounter such a dilemma, so let the editor lead you to learn how to deal with these situations. I hope you can read it carefully and be able to achieve something!

General methods of numerical histochemistry

1. The first and most common method, [] .slice.call method

Function toArray (obj) {

1.

Return [] .slice.call (obj)

two。

/ / Array.prototype.slice.call ()

3.

}

Ps: this method is actually a reference method, the comment part is fully written, and what is returned is an array object.

two。 The second method draws lessons from the makeArray method in jq.

Function makeArray (obj) {

1.

Var target = []

two。

If (obj! = null) {

3.

Var I = obj.length

4.

If (I = null | | typeof obj = = 'string' | | typeof obj = =' function' | |

5. Obj.setInterval) {/ /

If it is a string, a function win object, pay this element to the first element that creates the array and return it

Target [0] = obj

1.

} else {/ / if not the above elements, assign each obj to every index of target through a loop

two。

While (I) {

3.

Target [--I] = obj [I]

4.

}

5.

}

6.

}

7.

Return target

}

3. The third method

Function $arr (ele) {

1.

If (! ele) {

two。

Return []

3.

}

4.

If (ele.toArray) {

5.

Return ele.toArray ()

6.

}

7.

Var length = ele.length | | 0, results = new Array (length)

8.

While (length--) {

9.

Results [length] = ele [length]

10.

}

11.

Return results

twelve。

}

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