看完《javascript语言精粹》中的array.sort(comparefn)一节（Page81），很有启发性，于是自己试着实现这样一个通用函数by：无论数组对象为何种类型，调用此函数就能实现人们一般认知意义上的排序。
var by = function (name,minor){ return function (a,b){ var objBy = function (a,b){ var aValue,bValue;
aValue = a[name];
bValue = b[name]; if (aValue === bValue){ return typeof minor === 'function' ? minor(a,b) : 0;
} if (typeof aValue === typeof bValue){ return aValue < bValue ? -1 : 1;
}
return typeof aValue < typeof bValue ? -1 : 1;
} var generalBy = function (a,b){ if (a === b){ return 0;
} if (typeof a === 'string' && typeof b === 'string'){ return a.localeCompare(b);
} if (typeof a === typeof b){ return a < b ? -1 : 1;
}
return typeof a < typeof b ? -1 : 1;
}
if (a && b && typeof a ==='object' && typeof b === 'object'){
return objBy;
} return generalBy;
}
}
//test
var arry1 = [8,90,10,2,100,34,35,12]; var arry2 = [4,20,10,34,"hello word","杀星","my god","哈哈哈","高级编程","爱情","四货","一个人" ,"大人"]; var arry3 = [{name:"maggie",sex:"famale",age:43},{name:"gino",sex:"male",age:28},{name:"laura",sex:"famale",age:20},{name:"tino",sex:"male",age:25},{name:"amy",sex:"famale",age:27}];
console.log(arry1.sort(by())); console.log(arry2.sort(by())); console.log(arry3.sort(by('sex',by('age'))));