for-in.js

来自「这是《JavaScript学习源代码》一书的源代码」· JavaScript 代码 · 共 10 行

var i = 0 ; a = "";
// list all window properties in a variable
for ( property in window )
{
  a += property + "...";
i ++;
if(i % 2 == 0) a += "\n";
}
// display the window properties list
alert( a );