JavaScript Process Control Statements

Three Order of execution:

1, sequential implementation;

2, select the implementation;

3, loop execution.

Conditional statements:

determines whether the specified code is executed or skipped by judging the resulting result.

If statement:

var a = 3;

if (a>5) {

Console.log (a);

}

Attention:

1. The condition result after the IF keyword must be a Boolean value;

2. The parentheses after the IF keyword cannot be omitted;

3, if the curly braces {} After the If can be omitted, but is not recommended to omit.

If else:

Cases:

var b = 5;if (b>10) {Console.log ("B greater than 10");         }else {Console.log ("B less than 10");         }If Else statement nesting:Example:var sum = n;if (sum>90) {Console.log ("excellent");        }else {//<=90if (sum>=60) {console.log ("Liang");        }else{Console.log ("poor");        }        }else if:Example:var sum = 98;if (sum>90) {Console.log ("excellent");        }else if (sum>60 && sum<90) {console.log ("Liang");        }else {Console.log ("poor");        }Swich Case StatementExample:var a = 4;switch (a) {Case 1:Console.log ("111");Break ;Case 2:Console.log ("222");Break ;Case 3:Console.log ("333");Break ;default://When the value is not declared, the default is executedConsole.log ("4444");         }

JavaScript Process Control Statements