javascript/json .length 对于长度为 3 的数组返回 1

Question

我有以下 JavaScript:

var emails_array = ["[\"theiremail1\",\"theiremail2\",\"theiremail3\"]"];
var emails_array_length = emails_array.length;
alert("emails array: " + emails_array + "emails array length: " + emails_array_length);

此代码的结果显示的警报是:

emails array: ["theiremail1","theiremail2","theiremail3"]emails array length: 1

为什么不返回 3？

Answer 1

这是一个只有一项的数组:

var emails_array = [
    "[\"theiremail1\",\"theiremail2\",\"theiremail3\"]"
];

您可能追求的目标:

var emails_array = JSON.parse(["[\"theiremail1\",\"theiremail2\",\"theiremail3\"]"]);

http://jsfiddle.net/wtLo7h7s/