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How to request user permissions using facebook api in js?

how to request user permissions using facebook api in js? I want people to visit my site using facebook login. then I want to request facebook data from a visitor. now i can get data like this using js

FB.api('/100005658545226?fields=id,name,email') =>

{
    "id": "100005658545226",
    "name": "Mingfish Lin"
}

but there is no email in the json response, so I want to send a request to ask the user to allow this email permission. how can i make this work in js? for example, what cuts. enter image description hereenter image description hereenter image description hereenter image description here

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Call a login method with a callback and an options object with an array as a scope property, for example:

FB.login(callback, {scope: ['email']});


More information on Rights on Facebook

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