JavaScript For...In Statement

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于 2011-07-17 09:10:38 发布

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分类专栏： JavaScript 文章标签： javascript properties loops object each

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本文介绍了JavaScript中for...in循环的语法与用法，通过实例展示了如何使用for...in循环遍历对象属性。适用于初学者了解并掌握该循环语句的基本应用。

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The for...in statement loops through the properties of an object.

for (variable in object)
  {
  code to be executed
  }

Note: The code in the body of the for...in loop is executed once for each property.

Looping through the properties of an object:

var person={fname:"John",lname:"Doe",age:25}; 

for (x in person)
{
document.write(person[x] + " ");
}