關於facebook 登入!

印出 getPicture() 後是這樣的格式:
{"height":50,"is_silhouette":false,"url":"https:\/\/lookaside.facebook.com\/platform\/profilepic\/?asid=xxx&height=50&width=50&ext=xxx&hash=xxsxsxsxsxs","width":50}
我要怎麼直接抓出 url key的value?
元芳怎么了
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