JavaScript的舍入数量精确到0.5 [英] Javascript roundoff number to nearest 0.5

问题描述

有人可以给我一个想法，我如何将数字四舍五入到最接近的0.5。

我必须根据屏幕分辨率缩放网页中的元素，以及我只能分配字体大小到1,1.5或2以上等。

Can someone give me an idea how can i round off a number to the nearest 0.5.
I have to scale elements in a web page according to screen resolution and for that i can only assign font size in pts to 1, 1.5 or 2 and onwards etc.

如果我将它舍入到小数点后1位或不填。
我该如何完成这项工作？

If i round off it rounds either to 1 decimal place or none. How can i accomplish this job?

推荐答案

编写自己的函数，乘以2，rounds，然后除以2，例如

Write your own function that multiplies by 2, rounds, then divides by 2, e.g.

function roundHalf(num) {
    return Math.round(num*2)/2;
}

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