//对象单元的删除
//delete object.属性
var obj = { name: 'xiaoming', age: 22, number: '007', score: 99 };
//先遍历一遍
for(per in obj)
{document.write(obj[per] + '<br />');}
document.write('<hr />');//分隔符
//遍历一遍后，删除
delete obj.name;
//删除以后，再遍历一遍
for(per in obj)
{document.write(obj[per] + '<br />');}