日本xxxx18视频在线观看-日本xxxx1819-日本xxxwww在线观看-日本xxx-日本xx-日本www在线视频

使用hasOwnProperty

var json = {"key1":"val1","key2":"val2","key3":"val3"};

if(json.hasOwnProperty("key1")){

console.log(json["key1]);

}

resoult:

>>val1