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Echo.js is a standard stand-alone javascript image lazy loading (lazy loading) library. It is very small and fast, only 2KB. It uses HTML5's data-* attribute to delay the request to load image resources without relying on any third-party plugin libraries. Especially suitable for applications that need to load a large number of pictures on the mobile side.
Blank.gif is a 1 x 1 image used as the default image. The attribute value of data-echo is the real address of the image. You can set the width and height of the image, or set it in CSS, otherwise it seems that the image at the bottom and bottom is lazy.
