"jobs":[{"name":"iOS開發(fā)工程師","salary":"10k-15k","url":"www.baidu.com","desc":"廣州","mark":"group:1"},{"name":"金融集團CEO","salary":"10k-15k","url":"www.baidu.com","desc":"北京","mark":"group:2"},{"name":"運維開發(fā)工程師","salary":"10k-15k","url":"www.baidu.com","desc":"上海","mark":"group:3"},{"name":"資深視覺設計師","salary":"10k-15k","url":"www.baidu.com","desc":"廣州","mark":"group:4"}]怎么取出json數(shù)據(jù)中的mark這一項，例如我需要取group:4這個值得時候就可以用數(shù)組下標的方式，或者我怎么單獨取出group：4這個數(shù)值？如果我想取出group后面的值呢，例如group：1取出1，用group的值組成一個數(shù)組。