Introduction to ternary operator

1. What is ternary arithmetic: (Boolean expression? Value 0:Value 1;)

5>3 ?alert('5 big'):alert('3 big');

that is if(5>3){alert('5 big')}else{alert('3 big')};

Note: The difference between ternary operation and if(){}else{} is that ternary operation has a return value

For example:

var max = a>b? a:b;

2. How to write multi-condition ternary operation:

Example: Determine the four levels of ABCD based on student scores

var result = (sc<0 || sc>100) ?("Invalid score"):

sc>=90?("A"):

sc>=80?("B"):

sc>=60?("C"):("D");

Note: Priority issues need to be considered when calculating, add "()' to avoid wrong results!

3. Advantages of ternary operation: concise and clear

name = value 1 if condition else value 2

##　　　 Deep copy and shallow copy

　　　Function

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