' | | ' in javascript And the advanced usage of ' && '

' | | ' and ' && ' are common logical operators

But I did not expect in the JavaScript grammar world can also use them to play a trick, as a Java programmer of my face, especially on the Internet to check some, hereby record:

&&: Before and after, if true continues, false returns, the last value is returned if the last value is true

can also be used to change the pattern of the execution of the conditional statement

if (a >=5) {
Alert ("Hello");
}
Can be written as:
A >= 5 && alert ("Hello");

|| : The last value is returned if it is false, if it is true, and if the value is false until the last

Put a little more force on it:

Then Chen Duxiu a little:

Worship js!!!

' | | ' in javascript And the advanced usage of ' && '