How JavaScript calculates division

JavaScript method of calculating division: 1. Implement division and rounding through "Math.round(x)"; 2. Implement division and round down through "Math.floor(x)"; 3. Through "Math.ceil(x)" implements division and rounding up.

The operating environment of this article: windows7 system, javascript version 1.8.5, Dell G3 computer.

Division in Javascript

Today I will do an exercise and use JS to do paging. The formula used is:

totalPage =( totalNum-1)/numPerPage+1;

where totalPage represents the total number of pages, totalNum represents the length of all records returned, and numPerPage represents the number of rows displayed on each page. I have used this in java code before and there was no problem. But today when I used this formula in JS, something went wrong. The division operation "/" in JS could actually return a decimal, which was unexpected. .

Then I checked the information on the Internet and found a faster function, Math.ceil(x), rounded up, and it was done directly. .

// javascript除法如何取整
Math.round(x)  
// 四舍五入，如Math.round(0.60)，结果为1；Math.round(0.49)，结果为0；
Math.floor(x)   
//  向下舍入，如Math.floor(0.60)与Math.floor(0.49)，结果均为0；
Math.ceil(x)   
//向上舍入，如Math.ceil(0.60)与Math.ceil(0. 49)，结果均为1。

The division operation in JS ” / “Different from Java, the division operation in JS can return decimals, so pay special attention. .

Recommended study: "javascript Advanced Tutorial"

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