JavaScript DOM-7 Window Common sub-object (Navigator object, Location object, History object, Screen object)

First, navigator object

The role of Navigator objects

-The Navigator object contains information about the browser

-commonly used to obtain client browser and operating system information

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Common Properties and methods

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Ii. Location Object

The role of the Location object

-The Location object contains information about the current URL

-often used to get and change the URL of the current browser

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Common Properties and methods

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Third, the history of the object

The role of the History object

-The History object contains a historical record of the URLs visited by the user (in the browser window)

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Common Properties and methods

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Four, Screen object

The role of the Screen object

-The Screen object contains information about the client display screens

-often used to get the screen resolution and color

-JavaScript programs will use this information to optimize their output to meet the required display requirements. For example, a program can choose to use a large image or a small image depending on the size of the display, and it can choose to use a 16-bit color or a 8-bit color based on the color depth of the display. In addition, the JavaScript program can also be based on information about the screen size of the new browser window positioning in the middle of the screen

Common Properties and methods

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Summary: This chapter mainly introduces the JavaScript DOM window Common sub-object (Navigator object, Location object, History object, Screen object)

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JavaScript DOM-7 Window Common sub-object (Navigator object, Location object, History object, Screen object)