update doc

houxiao

2017-03-03 2b853a6df6bd03d272e8a0f77879568a89b47fd6

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[ 
{"name":"A","countrys":[{"country":"阿富汗"},{"country":"澳大利亚"}]}, 
{"name":"B","countrys":[{"country":"巴西"}]}, 
{"name":"D","countrys":[{"country":"中国"}]} 
]