Javascript for 循环变量“i"被视为字符串? [英] Javascript for loop var "i" is treated as a string?

问题描述

我正在使用 Titanium 构建一些移动应用程序，但我注意到这会产生出乎我意料的结果.

I am using Titanium to build some mobile apps and I noticed that this will give a result that I wasn't expecting.

data = ['a','b', 'c','d'];

for (var i in data){
    Ti.API.debug(i+1);
};

这将打印:01,11,12,13

This will print: 01,11,12,13

这是 Titanium 特有的东西还是 Javascript 中常见的东西?

Is this something particular to Titanium or is it generally in Javascript?

为什么不将i"视为整数?我很困扰.

Why isn't 'i' being treated as an integer? I am very confused.

感谢您的帮助.

推荐答案

这不能直接回答您的问题，但是如果您要循环遍历数组，则不使用 for (var i 在数据中).这会遍历对象的所有成员，包括方法、属性等.

This doesn't directly answer your question, but if you are looping through an array you should not use for (var i in data). This loops through all members of an object, including methods, properties, etc.

你想做的是:

for (var i=0, item; i<data.length; i++) {
    item = data[i];
}

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