对象、函数

var duixiang = {
    shuxing1:"张三",
    shuxing2:18,
    shuxing3:"男",
    shuxing4:function(){
        return "我是中国人";
    }
};
console.log(duixiang)
alert(duixiang.shuxing1+"说"+duixiang.shuxing4())

function hanshu(){
    alert(1+2);
}
hanshu();

function hanshu(x,y){
x,y是形参
    alert(x+y);
}
hanshu(3,6);
3,6是实参

function hanshu(x,y){
    return x+y;        
return是返回值
}
var jieshou = hanshu(5,6);
alert(jieshou);

var aa = 111;
function ceshi(){
    var aa = 222;
    var bb = 333;
    alert(aa);
    alert(bb);
}
ceshi();
输出函数时,函数内的局部变量优先于函数外的全局变量
alert(aa);
函数内的局部变量不影响函数外的变量

var attr = [1,2,3,4,5];
function hanshu(x){
    console.log(x);
}
hanshu(attr);