在 for 循环中设置数组内对象的值

Question

I want to define an object inside an array inside a for loop:

var test = [{}];

for(j = 0; j < 10; j++){ test[j]['name'] = "Jonh Lennon"; };

console.log(test[0]['name']);

When i try to do this, i get the error "cannot set property 'name' of undefined".

Answer 1

 var test = []; for(j = 0; j < 10; j++){ test[j] = []; test[j]['name'] = "Jonh Lennon"; }; console.log(test[0]['name']);

Answer 2

Only test[0] is defined as an object literal in your code. So as your loop increments past 0, test[j](where j is between 1 and 9 inclusive) will return undefined.

Here's a quick fix that will have return an array of object literals with a key value pair of {'name':'Jonh Lennon'}.

var test = [{}];

for(j = 0; j < 10; j++){ 
 test[j] = {};
 test[j]['name'] = "Jonh Lennon";   
};

console.log(test); // Log all john lennons