Question

我想在这里提一点指导。为此使用 JS Bin 。整个问题是：＆＃34; name＆＃34;当用作VAR并在数组中时： --- console.log打印每个字母：

var word = "Hi";
var name = ["John","Suzette","Mari-Louise","Tinus","Hendrik","Koos","Elna","Elbie"];
// Greeting
greeter(word,name);

function greeter(str,arr){
 var counter;
  for(counter = 0;
    counter < arr.length;
    counter++) {
    console.log(str + " " + arr[counter]);
    }
   }

输出

"Hi J"
"Hi o"
"Hi h"
"Hi n"
"Hi ,"
"Hi S"
"Hi u"

但是，将VAR更改为userName会产生正确的结果，..我无法找到任何对＆＃39; name＆＃39; 的引用是JS中的保留字，所以如果有人可以为我澄清这一点，它会粉碎。

var word = "Hi";
var userName = ["John","Suzette","Mari-Louise","Tinus","Hendrik","Koos","Elna","Elbie"];
// Greeting
greeter(word,userName);

function greeter(str,arr){
 var counter;
  for(counter = 0;
   counter < arr.length;
   counter++) {
   console.log(str + " " + arr[counter]);
    }
   }

结果**

"Hi John"
"Hi Suzette"
"Hi Mari-Louise"
"Hi Tinus"
"Hi Hendrik"
"Hi Koos"
"Hi Elna"
"Hi Elbie"

Answer 1

哦但是＆＃39;名字＆＃39;保留：

http://www.w3schools.com/js/js_reserved.asp

查看JavaScript对象，属性和方法

Answer 2

如果进行调试，您会注意到执行代码时已经定义了name。这是因为全局window上下文具有name属性，即字符串当您尝试将["a", "b", "c"]设置为此属性时，浏览器会将其转换为字符串，并变为"a,b,c"。这就是为什么当你遍历它时，你会得到角色。

console.log(name); // it already exists

var name = ["a", "b", "c"]; // assigns window.name property, becomes a string
var nameqwe = ["a", "b", "c"]; // creates local variable

console.log(name);
console.log(nameqwe);

在Array中使用名称会在Firefox中产生不同的结果

2 个答案: