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Js drag prototype declaration and usage summary, js drag prototype Declaration

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Js drag prototype declaration and usage summary, js drag prototype Declaration

The following is a self-written prototype declaration about js Drag and Drop: the code is as follows:

Notes:

1. Point this to who it actually points to-find out the object it refers

2. Use of the call () method

3. What is the difference between assigning a parent prototype to a child level directly and assigning it to a child level using?

For example:

For (var I in Drag. prototype) {LimitDrag. prototype [I] = Drag. prototype [I]; ---------- THE CHILD level is changed and its parent level is not affected} LimitDrag. prototype = Drag. prototype; --------- directly assigning the prototype to the sub-level will cause the parent level to change when the sub-level changes.

The Code is as follows:

<Html> 

The above is all the content of this article, hoping to help you learn.

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This article is an English version of an article which is originally in the Chinese language on aliyun.com and is provided for information purposes only. This website makes no representation or warranty of any kind, either expressed or implied, as to the accuracy, completeness ownership or

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