How to use javascript to get an array of objects

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GetElementsByTagName

This method returns an array of objects (exactly a HTMLCollection collection, which is not an array in the real sense), each of which corresponds to an element in the document with a given tag. Similar to getElementById, this method provides only one parameter, which is the name of the specified tag. The sample code is as follows:

Document.getElementsByTagname ('li') / / li is the name of the tag

It is important to note that this method can be called not only by document objects, but also by ordinary elements. Examples are as follows:

Var demo = document.getElementById ('demo'); var lis = demo.getElementsByTagname (' li')

Similarly, this method is compatible with mainstream browsers, and even IE6+, can be used boldly.

What is the role of JavaScript? 1, can embed dynamic text in HTML pages.

2. Respond to browser events.

3. Read and write HTML elements.

4. Verify the data before it is submitted to the server.

5. Detect the browser information of visitors.

6. Control cookies, including creation and modification, etc.

7. Server-side programming based on Node.js technology.

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