How JavaScript rounds a number and retains N decimal places

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Round a number to retain N decimal places var num = 2.443242342 num = num.toFixed (4); / / what is the purpose of num will be equal to 2.4432JavaScript 1, can embed dynamic text in HTML pages. 2. Respond to browser events. 3. Read and write HTML elements. 4. Verify the data before it is submitted to the server. 5. Detect the browser information of visitors. 6. Control cookies, including creation and modification, etc. 7. Server-side programming based on Node.js technology.

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