javascript - Why I get error 'Cannot set property '0' of undefined' -

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i not understand why can not create new object

the error: uncaught typeerror: cannot set property '0' of undefined

i got error on line code. this.gameanimals[i] = {};

this = game; gameanimals[0] = 'frog';

so why have error ? many thanks.

var game = {     init: function(){         this.property1 = 1;         this.property2 = 2;         this.property3 = 3;         this.property1000 = 1000;     },       cons: function(gameanimals){          for(var = 0; < gameanimals.length; i++){              this.gameanimals[i] = {};         }      },     };  var gameanimals = ['frog', 'lion', 'cat']; game.cons(gameanimals);

you trying set zero-th element of this.gameanimals.

however, this.gameanimals doesn't exist, since game object doesn't have private member gameanimals. hence it's undefined, try set property on.

i think may mean gameanimals, without prefixing this. (alternatively, you'll need create this.gameanimals first if that's meant.)


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