process control if and else

if (condition) {} block
} else {code block
Process execution: {If the code execution condition is satisfied if the condition is not satisfied} {} later execute the code
and if the opposite conditions else, even if the conditions are met else will perform a one at a time
Only execute if either executed or else a
where N1 = 20;
where n 2 = 30;

console.log ( "My age is:" + n1 + "years old");
} the else {
console.log ( "My age is:" + n2 + "years old");
}

if (condition) {} block
} else {code block
Process execution: {If the code execution condition is satisfied if the condition is not satisfied} {} later execute the code
and if the opposite conditions else, even if the conditions are met else will perform a one at a time
Only execute if either executed or else a
where N1 = 20;
where n 2 = 30;

console.log ( "My age is:" + n1 + "years old");
} the else {
console.log ( "My age is:" + n2 + "years old");
}

Else if without a separate

var isEated = true
if(isEated){
console.log("吃了啥");
}

A plurality of conditions is determined if .. else if ... else if..else, if ... if ... if (not recommended)

var age = 3;
if(age<1){
}else if(age>7){
console.log("儿童");
}else if(age<15){
console.log("少年");
}else{
console.log("花甲");< br> }

if..if as long as the condition is true if all will be executed

if(age<7){
console.log("儿童");
}
if(age<15){
console.log("少年");
}

if nested

65-year-old male retirement age retirement age of 60 years old girl