Code detailed example operations for sorting arrays and object arrays in JS

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Code example tutorial for sorting arrays and object arrays through js

Note: the sort() method will change the original array, and the default is to sort the array in unicode order

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1. js The sort method implements array sorting

var arr = [2,3,13,17,4,19,1];
arr.sort() // [1, 13, 17, 19, 2, 3, 4]

If you want to sort the array according to size, you need to add a comparison function to the sort() method of js

var arr = [2,3,13,17,4,19,1];
arr.sort(function(a,b){ // 比较函数
   return b - a;    // 降序, 升序为 a - b 
})
console.log(arr) //  [19, 17, 13, 4, 3, 2, 1]

2. js The sort method implements the sorting of object arrays

is similar to the usage in arrays

var arr = [
            { name:"小明", age:12 },
            { name:"小红", age:11 },
            { name:"小刚", age:15 },
            { name:"小华", age:13 }
        ];
        
function compare(p){ //比较函数
    return function(m,n){
        var a = m[p];
        var b = n[p];
        return a - b;
    }
}
arr.sort(compare("age"));
console.log(arr); 
//升序，结果： [{name: "小红", age: 11}, {name: "小明", age: 12}, {name: "小华", age: 13},

I would like to point out any shortcomings, thank you very much!

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