How to understand the histochemistry in javascript
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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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