Special usage of "| |", "&&" in JavaScript

The special usage of "| |", "&&" in Javscript can make the code simple and Beautiful in the right place.

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A = 6;

a>=5 && alert (' OK ');

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A = 6;

Alert (a >= 5 && "yes") | | (A < 5 && "no");

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Judging from left to right, encounter false returns, if not encountered, returns the last

var a = true && && 45;

alert (a);

var a = True && 0 && ' aaa ';

alert (a);

var a = && && ' aaa ' && true && 0 && 10;

alert (a);

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From left to right, look for the first return to true, and return the last one without encountering it.

A = 12 | | False | | 13;

alert (a);

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var a = 10;
var b = {' 5 ': 1, ' Ten ': 2, ' ': 3, ': 4}[a] | | 0;

Alert (b)

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Special usage of "| |", "&&" in JavaScript