What is the javascript ternary operator? Introduction to the usage of js ternary operator

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"Ternary Operator" What is the ternary operator

Conditions? Execution if the condition is true: Execution if the condition is not true;

is equivalent to a simple if()else() statement

For example:

var num=10；
if(num>5 && num<=10){
num++;
}else{
num--;
}

Ternary operator writing method

num>5 && num<=10 ? num++:num--;
三元运算符另外一种情况，相当于只有if()的语句，改写为三元运算符写法，
var num=10;
if(num>5 && num<=10){
 num++;
}

num>5 && num<=10?num :null; //null is used as a placeholder when the condition is not true symbol, if you don’t write anything after the colon, an error will be reported. You can use null, undefined, void 0 (that is, undefined) as a placeholder;

In a certain situation, use multiple statements to operate, use small Surrounded by brackets

##

var num=10;
if(num>5 && num<=10){
 num++;
console.log(num);
}

The above example can be rewritten like this

num>5 && num<=10?(num, console.log(num)):null; Multiple statements are separated by commas

*Keywords such as break, continue, return, etc. cannot appear in the operation of the ternary operator;

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