javascript - Why this window.opener.reload is not a function error? -

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i have snippet this.

if (window.opener != null) {     window.opener.reload(); }

when called, firebug shows,

typeerror: window.opener.reload not function

and chrome console says,

uncaught typeerror: object [object global] has no method 'reload'

what wrong?

p.s: typeof window.opener "object".

reload method of location object, not window object.

window.opener.location.reload();

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