JavaScript 冒泡排序

1. 常规方法

    function sort_bubble(arr) {
      var temp;
      for(var i = 0; i < arr.length;i ++) {
        for(var j = i + 1;j < arr.length;j++) {
          if (arr[i] > arr[j]) {
            temp = arr[i];
            arr[i] = arr[j];
            arr[j] = temp;
          }
        }
      }
      return arr;
    }
   
    var result = sort_bubble([1,3,5,2,64,4]);
    console.log(result);
   

2. es6 对象解构赋值实现

   function sort_bubble(arr) {
      for(let x = 0; x < arr.length; x ++) {
        for (let y = x + 1; y < arr.length; y ++) {
          [arr[x],arr[y]] = arr[x] > arr[y]?[arr[y],arr[x]]:[arr[x],arr[y]]; 
        }
      }
      return arr;
    } 
   
    let result = sort_bubble([1,3,2,5,4,7]);
    console.log(result);
   

3. 传入两个参(arr,fn)，控制升序，降序

    function sort_bubble(arr,fn) {
      let length = arr.length;
      for(let x = 0; x < length; x ++) {
        for (let y = x + 1; y < length; y ++) {
          [arr[x],arr[y]] = fn(arr[x],arr[y])?[arr[y],arr[x]]:[arr[x],arr[y]]; 
        }
      }
      return arr;
    } 
    function ascending(x,y) {
      return x > y;
    }
    function desending(x,y) {
      return x < y;
    }
    let result1 = sort_bubble([1,3,2,5,2,1,1,2,5,4,7],ascending);
    let result2 = sort_bubble([1,3,2,5,2,1,1,2,5,4,7],desending);
    console.log(result1);
    console.log(result2);