var  a = 9,

　　b,

　　c={age:9},

　　d;

b = a;

b = 19;

console.log(a)

console.log(b)

d = c;

d.age = 22;

console.log(c.age)

console.log(d.age)

函数参数的值传递

var a = 9,

　　b = {name:'laoma',age:18}

function demo (c1,c2) {

　　c1 = 29;

　　c2.name = '666'

}

demo(a,b)

arguments不是数组