san_rx的博客

1、参数默认值function log(x, y ='world'){ console.log(x,y);}log('hello'); // hello worldlog('hello','china'); //hello china --默认值可以覆盖function foo(x = 5){ let x = 1; //error const x =2; //error

交换两个元素的值unction swap(i,j){ var tmp; tmp = i; i = j; j = tem;}一、冒泡排序 不断比较相邻两个元素的值，遍历一次，将最大（小）值冒泡到序列尾部（开头）//冒泡排序fucntion bubbleSort(arr){ var len = arr.length; for(var i = 0; i