遍历一个对象用for in, 遍历一个数组用.length
var x;
var txt="";
var person={fname:"Bill",lname:"Gates",age:56};
for (x in person)
{
txt=txt + person[x]+"<br>";
}
var x;
var txt="";
cars=["BMW","Volvo","Saab","Ford"];
for (var x=0;x<cars.length;x++)
{
txt=txt+cars[x]+"<br>";
}
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