jQuery将inArray添加为最后一个数组/对象元素

Question

I have noticed that in some cases, when jQuery is imported, it adds as last element of defined object or array - inArray ... that totally ruins for ... in loop, because it counts that stupid function as element.

Example:

console.log(v);
VM19135:2 Uncaught ReferenceError: v is not defined
var v = [];
console.log(v);
VM19222:2 [inArray: function]

What the hell???? How to avoid that?

Here's an example site that gives those results: http://kobieta.interia.pl

Just enter console, and type:

var v = []; console.log(v);

Answer 1

You need to use Object.prototype.hasOwnProperty() when you run into this problem. This happens because of the way JavaScript uses prototypes.

It's annoying but you will need to run your for-in loop similar to this:

var v = [];
for (var name in v) {
  if (v.hasOwnProperty(name)) {
    console.log(v[name]);
  }
}