The effect of zooming in on a Taobao store is similar to the principle of using a slideshow.

Today I got familiar with the mouse zooming effect on the front end of Taobao, which is similar to the principle of using slides. I will analyze this code here.

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The code is as follows:

class="J_TWidget hidden" is the key to Taobao's built-in js code to control image attributes. It is used to obtain the node of the div and control the node. As for style, it is the definition of the style, including length, width, background image

<div data-widget-config="{'trigger':'.all_t1','align':{'node':'.all_t1','offset':[0,-160],'points':['bc','tc']}}" data-widget-type="Popup" class="J_TWidget hidden"> This is undoubtedly the definition of the properties of the special effects.

node: 'custom', // reference element. The popup is positioned relative to the reference element. Just like writing contacts,

Supports writing of class and id selectors

points: [tr,tl], // ['tl', 'tr'] means that the popup's tl is aligned with the reference node's tr.

For the specific meaning and value of tl and tr, please see the screenshot below.

t(top),c(center),b(bottom),l(left),r(right)

offset: [0,0] // Valid value is [n, m], after points are aligned, offset value,

Generally, it can be used for fine-tuning. n and m represent the alignment of two points.

The offset between the x and y coordinates

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