can-present-dialog_zh.md

#.canPresentDialog(info)

这个方法可以检查用户的设备是否可以打开特定的 对话框。可以检查的对话框类型有：

• Share对话框
• Message对话框

如果可以打开返回_true_, 否则返回_false_.

##参数

plugin.FacebookAgent.prototype.canPresentDialog = function(info){}

Name	Type	Required	Description
info	Object	Yes	对话框信息，和在dialog方法中传递的参数一样

###对话框类型:

Value	Dialog type
shareLink	分享链接的Share对话框
sharePhoto	分享图片的Share对话框
shareOpenGraph	分享Open Graph story的Share对话框
messageLink	发送链接的Message对话框
messagePhoto	发送图片的Message对话框
messageOpenGraph	发送Open Graph story的Message对话框

##示例

facebook = plugin.FacebookAgent.getInstance();

var map = {
    "dialog": "shareLink",
    "link": "http://www.cocos2d-x.org"
};

if ( facebook.canPresentDialog(map) ) {
    facebook.dialog(map, function(errorCode, msg) {
        cc.log("The 'shareLink' dialog can be presented.");
        // ...
    });
} else {
    cc.log("The 'shareLink' dialog can not be presented, fallback to feed dialog.");
    map["dialog"] = "feedDialog";
    facebook.dialog(map, function(errorCode, msg){
        // ...
    });
}