CODEWITHSUNDEEP
javascript
arachide
arachide

Reputation: 8066

can not access the array of an object

Below are my javascript code:

function A (no ){
    this.no=no;
};
function AController (){
    this.amount =0;
    this.array=[]; 
};
AController.prototype.initArray=function(){

    for(var i=1;i<=this.amount;i++){

        var tem=new A(i) ;
        this.array.push(tem);
    }
};

then I execute somewhere

var f=new AController();

f.amount=2;
f.initArray();
for(var i=1 ;i<=2;i++){    
   f.array[i].no=0;    
}

but it always reports

JS: TypeError: f.array[i] is undefined

your comment welcome

Upvotes: 0

Views: 66

Answers (1)

zs2020
zs2020

Reputation: 54514

You need to loop from 0

for (var i = 0; i < 2; i++) {
    f.array[i].no = 0;
}

After push operations, the array is [A(1), A(2)], so f.array[2] will be undefined. Since you tried to assign no property on the 3rd object in the array which is undefined, hence you got that error.

Upvotes: 4

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