How to get the absolute value of a javascript number

How to obtain the absolute value of a javascript number: 1. Use the abs() method of the Math object, with the syntax "Math.abs(number)"; 2. Use the "-" operator, with the syntax "-number"; 3. Use the "*" operator and the sqrt() method, with the syntax "Math.sqrt(a*a)".

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

javascript takes the absolute value of a number

Method 1: Use Math.abs()

var aaa=-20;
console.log(Math.abs(aaa));

Method 2: Use the "-" operator

var aaa=-20;
console.log(-aaa);

Note: Use the "-" operator to get When using absolute values, you must ensure that the number is negative.

Method 3: Use the "*" operator and the sqrt() method

First use the "*" operator to find the square value, and then use the sqrt() method to get Square root

var a=-25;
a=a*a;
a=Math.sqrt(a);
console.log(a);

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