为什么Math.random在我的代码上不起作用？

Question

This is my lift program. But Math random doesn't work.

var person = {
     name: "Gorg",
     position: 2,
     goal: 9
 };
 var lift = {
     position: function() {
         var x = Math.floor((Math.random() * 10) + 1);
     }
 };
 console.log("Ok, buddy! You are at " + person.position + " floor");
 console.log("Lift is at " + lift.position + " floor");

 if (lift.position != person.position) {
     console.log("Please wait a minute, lift's coming");
 } 
 else {
     console.log("Lift is here. Please enter!");
 }

 if (lift.position > person.position) {
     for (i = person.position; i <= lift.position; i++) {
         console.log(i);
     }
 } 
 else if (lift.position < person.position) {
     for (i = person.position; i >= lift.position; --i) {
         console.log(i);
     }
 }  
 else {
     console.log("You're already at this level");
 }

 if (lift.position !== person.position) {
     if (person.goal > person.position) {
         for (i = person.position; i <= person.goal; i++) {
             console.log(i);
         }
     } 
     else if (person.goal < person.position) {
         for (i = person.position; i >= person.goal; --i) {
             console.log(i);
         }
     } 
     else {
         console.log("You're already at this level");
     }
 }
 console.log("Congratulation! You achieve your goal!");

Answer 1

Two problems

First, change your lift.position function so that it returns the value (rather than assign it to an inaccessible local variable).

position: function() {
  return Math.floor((Math.random() * 10) + 1);
}

Second, make sure you call the lift.position() function (use parentheses to call a function)...

lift.position()

Answer 2

 var person = { name: "Gorg", position: 2, goal: 9 }; var lift = { position : function() { var x = Math.floor((Math.random() * 10) + 1); return x; } }; console.log("Ok, buddy! You are at " + person.position + " floor"); console.log("Lift is at " + lift.position() + " floor"); if (lift.position != person.position) { console.log("Please wait a minute, lift's coming"); } else { console.log("Lift is here. Please enter!"); } if (lift.position > person.position) { for (i = person.position; i <= lift.position; i++) { console.log(i); } } else if (lift.position < person.position ) { for (i = person.position; i >= lift.position; --i) { console.log(i); } } else { console.log("You're already at this level"); } if (lift.position !== person.position) { if (person.goal > person.position) { for (i = person.position; i <= person.goal; i++) { console.log(i); } } else if (person.goal < person.position ) { for (i = person.position; i >= person.goal; --i) { console.log(i); } } else { console.log("You're already at this level"); } } console.log("Congratulation! You achieve your goal!"); 

From what I could understand, this is the solution

//returned x here;
var lift = {
        position : function() {
        var x = Math.floor((Math.random() * 10) + 1);
    return x;

      } 

//corrected the call to lift.position as lift.position()

console.log("Lift is at " + lift.position() + " floor");

Answer 3

You have assigned a function to position property of the person object. To invoke the method you need to call function, ie lift.position() not lift.position. It will be better if you change the name of the property from "position" to "getPosition".