 ## Limit numbers without instructions if | |
[ 所属分类 前端（javascript） | 发布者 店小二04 | 时间 2018 | 作者 红领巾 ] 0人收藏点击收藏

I was curious if there is a way to limit a number with javascript without using if statements. Say I have a number that goes from 0 to 100, but I only want it to allow 30 to 70. So anything less than 30 became 30 and anything greater than 70 became 70. With if statements it would look like this:

var x = 0; if (x > 70) { x = 70; } if (x < 30) { x = 30; }

I'm looking more for a solution involving arithmetic.

Of course you can do it with the conditional ternary operator ( .. ? .. : .. ), but I assume that you are asking about just doing it with math only, no conditionals. If so, then you can do it with an Absolute function:

var x30 = x - 30; var x30 = (x30 + Math.abs(x30)) / 2 + 30; var x70 = 70 - x; var x70 = 70 - (x70 + Math.abs(x70)) / 2;

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