javascript中的console.log和return有什么区别

Question

Whats the difference between console.log and return in JavaScript? they both seen to print out things in terminal.

  isPrime(num){
    if (num % i === 0)) {
     return false ;
   }
  for (var i = 2; i < num; i++) {
    if (num % i === 0) {
   return false;
    }
 }

Answer 1

Return

The return statement ends function execution and specifies a value to be returned to the function caller.

• https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Statements/return

Console.log

The Console object provides access to the browser's debugging console (eg, the Web Console in Firefox)

console.log Outputs a message to the Web Console under development tool concel tab.

• https://developer.mozilla.org/en-US/search?q=console
• https://developer.mozilla.org/en-US/docs/Web/API/Console/log
• What is console.log?

Answer 2

console.log() is meant to print output to the console. However, return is meant to send data back to variable when a function is called, like this:

var foo = bar();

If bar() had a return statement, the value would be passed to foo .