浅拷贝的实现
// 浅拷贝函数
var dad = {name:'chen',age:18};
var son = {sex:'男'};
function clone(dad,son){
var son = son || {};//判断s对象是否存在，不存在则定义s为空对象
for (var prop in dad) {
son[prop] = dad[prop];
};
return son;//返回s对象
};
print(clone(dad,son));
// 浅拷贝函数
var dad = {name:'chen',age:1
