类型错误：无法读取 null 的属性

Question

I get the error in the title even though I have tried all the solutions. About the value of null;

If my code is ;

Output: TypeError: Cannot read property of null


  
 
  
  
  
 
   
 
    
case '!facebook':
face.Profile(facebook, function(result) {

let like = result.profiles.like;
let comments = result.profiles.comments;
        							
if(like === null || comments === null){
//code.
}
else {
//code.
}
});
break;
 
   
 
  

Answer 1

You have to verify that each child of your object exists before you reference the next level. In your case, that means testing the existence of result and then result.profiles before trying to use any of the object values in profiles . See the code below.

Without seeing the rest of your case statement or how you're setting the value of face , it's hard to tell if you're going to run into other issues.

 case '!facebook': face.Profile(facebook, function(result) { // Set default values let like = null; let comments = null; // Set values only if there's a result containing profiles if (result && result.profiles) { like = result.profiles.like; comments = result.profiles.comments; } if (like === null || comments === null){ //code } else { //code } }); break;