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What is the usage of random in javascript
- 醉折花枝作酒筹Original
- 2021-06-10 11:49:144791browse
In javascript, the usage of random is "Math.random()". The "random()" method can return a random number between 0 and 1. The value returned by this method can be 0, but it cannot be 1.
The operating environment of this tutorial: windows7 system, javascript version 1.8.5, Dell G3 computer.
Get a random integer between A and B:
Math.floor(Math.random()*B)+A
Get a random Boolean value:
(Math.random()>0.495): 50% There is a probability of returning true and a 50% probability of returning false
Another example is (Math.random()>0.7): There is a 70% probability of returning true and a 30% probability of returning fasle
Remember Math .random() never returns 1. At the same time, because we are using Math.floor() to round down, the final result we obtain cannot be 1. This ensures that we get a number between 0 and 1.
Example:
<html> <body> <script type="text/javascript"> document.write(Math.random()) </script> </body> </html>
Result:
0.5528221991387223
[Recommended learning: javascript advanced tutorial]
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