数组的值传递

var num = 100;
var num1 = num;
num1 = 300;
console.log('num', num);//100  300
console.log('num1', num1);// 300

var arr = ['李白', '张艺兴', '孙楠', '蔡旭坤'];
var arr1 = arr;
arr1[0] = '李冰冰';
console.log('arr', arr);//['李冰冰', '张艺兴', '孙楠', '蔡旭坤'];
console.log('arr1', arr1);//['李冰冰', '张艺兴', '孙楠', '蔡旭坤'];