- 编程程序，完成下列需求：
- 创建一个空对象，变量名为user；
- 添加一个name属性，并设置值为John；
- 添加一个surname属性，并设置其值为Mike；
- 将name属性的值改为Peter;
- 删除user的name属性
- 编写程序，实现下列需求：计算下面fruit对象共有多少个水果，应该输出50。
var fruit = {
apple: 20,
pear: 20,
peach: 10
};
// write your code here...
新建js文件，完成上述需求。
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