fix support string, chinese sort

[JoosAI]

test code

 var users = [
        {'name': '孤',py:'gu'},
        {'name': '帆',py:'fan'},
        {'name': '远',py:'yuan'},
        {'name': '影',py:'ying'},
        {'name': '碧',py:'bi'},
        {'name': '空',py:'kong'},
        {'name': '尽',py:'jin'},
    ];
    var orderedPY = _.orderBy(users,['py'],['asc']);
    var orderedCn = _.orderBy(users,['name'],['asc']);    
    console.log(orderedPY);
    console.log(orderedCn);

[lock]

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