1. Summary of Math
The Math object is not a constructor, but a concrete object with properties and methods of mathematical constants and functions. Math related operations (absolute values, roundings, maxima, and so on) can use members of Math.
| Property, method name | function |
|---|---|
| Math.PI | PI |
| Math.floor() | Take down the whole |
| Math.ceil() | Take up the whole |
| Math.round() | Note that the nearest rounded version is -3.5 and the result is -3 |
| Math.abs() | The absolute value |
| Math.max()/Math.min() | Find the maximum and minimum |
| Math.random() | Gets a random value in the range [0,1) |
Note: The above method must be used with parentheses
2. Random method random()
The random() method returns a random decimal in the range [0, 1], where 0 <= x < 1
Gets a random integer in the specified range:
Get a random integer between two numbers, including two numbers
function getRandom(min, max) {
return Math.floor(Math.random() * (max - min + 1)) + min;
}
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