sort方法對象中按照某個屬性排序

arr.sort(compareFunction)

compareFunction：用來指定按某種順序進行排列的函數。如果省略，元素按照轉換爲的字符串的諸個字符的Unicode位點進行排序。

var arr = [
    {name:'zhangsan',age:5},
    {name:'lisi',age:23},
    {name:'wangwu',age:8}
];

function compareFunction(property){
    return function( a, b ){
        if (a[property]> b[property]) {
            return 1;
        }
        if (a[property]< b[property]) {
            return -1;
        }
        return 0;
    }
}
console.log(arr.sort(compareFunction('name')));