js打印数组,js打印对象的方法

//打印对象
function writeObj(obj){
var description = "";
for(var i in obj){ 
var property=obj[i]; 
description+=i+" = "+property+"
"; 
} 
alert(description);
}

//打印数组
function print_array(arr){
    for(var key in arr){
        if(typeof(arr[key])=='array'||typeof(arr[key])=='object'){//递归调用  
            print_array(arr[key]);
        }else{
            document.write(key + ' = ' + arr[key] + '<br>');
        }
    }
}

var a=new Array(0,1,2,3,4,new Array('dog','cat','mao'));
print_array(a);