Question

我刚刚学习了es 6而且我刚刚在...运行此代码时... ...

var name = [＆＃34; Rahul＆＃34;，＆＃34; Ritika＆＃34;，＆＃34; Amit＆＃34;，＆＃34; Radhika＆＃34;]; 的console.log（name.length）;

答案是25 .. 25为什么？它必须有答案4但是给出25我不知道为什么？

我只是在浏览器控制台中运行代码答案是相同的...... 25

但当我将变量名称的名称更改为＆＃34; c_name＆＃34;它工作得很好......

让c_name = [＆＃34; Rahul＆＃34;，＆＃34; Ritika＆＃34;，＆＃34; Amit＆＃34;，＆＃34; Radhika＆＃34;]; 的console.log（c_name.length）;

当我试图执行此代码时，out再次错过了行为......

//姓名变量让名字= [＆＃34; Rahul＆＃34;，＆＃34; Ritika＆＃34;，＆＃34; Amit＆＃34;，＆＃34; Radhika＆＃34;]; for（let i = 0; i＆lt; name.length; i ++）console.log（name [i]）;

****output****
"Rahul"
"Ritika"
"Amit"
"Radhika"

//其他变量让c_name = [＆＃34; Rahul＆＃34;，＆＃34; Ritika＆＃34;，＆＃34; Amit＆＃34;，＆＃34; Radhika＆＃34;];   for（let i = 0; i＆lt; c_name.length; i ++）console.log（c_name [i]）;
   的输出

"R"
"a"
"h"
"u"
"l"
","
"R"
"i"
"t"
"i"
"k"
"a"
","
"A"
"m"
"i"
"t"
","
"R"
"a"
"d"
"h"
"i"
"k"
"a"

for loop

Output with name

Output with c_name

Answer 1

这是因为name is a property on window object。

如果您运行的代码不是全局范围，它将为您提供正确的结果。以下代码示例显示了如何使用IIFE (Immediately Invoked Function Expression)：

执行此操作

＆＃13;

(function(){ 
  var name = ["Rahul","Ritika","Amit","Radhika"];  
  console.log(name.length);
})();

＆＃13;

为什么array.length显示错误的结果....用变量＆＃34; name＆＃34;

1 个答案: