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High-performance JavaScript notes

Source: Internet
Author: User
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1: When Javascript is running, other tasks cannot be processed by the browser.

2: the browser will not render any part of the page before encountering the <body> label.

3: Place all <SCRIPT> labels at the bottom of the <body> label to minimize the impact on page download.

The first law of javascript:Put the script at the bottom


4: The parsing process of the page is blocked when each <SCRIPT> tag is downloaded. Therefore, limiting the total number of <SCRIPT> pages can also improve the performance.

5:

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