jquery determines mobile phone rotation angle

With the popularity of smartphones, more and more people use their phones to perform various operations, such as browsing the web, playing games, watching videos, etc. When using a mobile phone, sometimes you need to determine the rotation angle of the mobile phone, such as adapting the size and direction of the screen, rotating certain elements, etc., and jQuery can easily complete this task.

jQuery is a widely used JavaScript library that simplifies the writing and operation of JavaScript, allowing developers to implement various functions more quickly. In jQuery, you can easily use the following code to get the rotation angle of the phone:

$(window).bind('orientationchange', function(event) {
    var orientation = window.orientation;
    switch(orientation) {
        case 0:
            // 竖屏
            break; 
        case 180:
            // 竖屏，上下颠倒
            break; 
        case -90:
            // 左旋转横屏
            break;
        case 90:
            // 右旋转横屏
            break;
    }
});

In the above code, jQuery’s bind() method is used to bind orientationchange Event, this event will be triggered when the phone rotates. Then obtain the rotation angle of the phone through the window.orientation attribute, and process the corresponding logical operations according to different angle values.

It is worth noting that since the window.orientation property is used here to obtain the rotation angle, the code must be run on the mobile phone, because on the desktop browser, the property The value is always 0 because desktop browsers do not have rotation functionality.

In addition to the above code, there are some other methods to determine the rotation angle of the mobile phone. For example, use the window.screen object to get the height and width of the screen:

var screenWidth = window.screen.width;
var screenHeight = window.screen.height;
var isLandscape = screenWidth > screenHeight;

Compare the size according to the width and height of the screen to determine whether the phone is currently in landscape mode.

In addition, there are some third-party plug-ins in jQuery that can easily obtain and determine the rotation angle of the mobile phone, such as jquery.rotate.js, jquery.mobile.rotate.js etc.

When using these plug-ins, you only need to introduce the corresponding files and use them according to their documentation. These plug-ins generally need to call the corresponding method to obtain the rotation angle. The general usage is as follows:

var angle = $(window).rotateDegrees();

The rotateDegrees() method in the above code is a method for obtaining the rotation angle. It returns is a number representing the degree of rotation.

To sum up, by using jQuery or its related plug-ins, you can easily obtain and determine the rotation angle of the mobile phone, which can achieve many interesting functions and interactive effects.

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