从数组中过滤数字 [英] Filtering numbers out from an array

问题描述

我有一个如下所示的数组，需要从中过滤出数字： [1,2]

I have an array like below and need to filter out the numbers from it ex: [1,2]

var str = [
  "https://xx.jpg",
  "https://xx.jpg",
  "1",
  "https://guide.jpg",
  "2", 
  "/static.jpg"
]

我有以下代码：

var filtered = str.filter(function(item) {
  return (typeof item === "number")
});

但它没有过滤，因为它是一个字符串。

but it is not filtering as it is a string.

怎么做？

推荐答案

做一个小改动你的代码可以使它工作，这可能会有效。

Making a small change to your code to make it work, this might possibly work.

var str = ["https://xx.jpg", "https://xx.jpg", "1", "https://guide.jpg", "2", "/static.jpg"];
var filtered = str.filter(function (item) {
  return !(parseInt(item) == item);
});
console.log(filtered);

或者如果你想要数字：

var str = ["https://xx.jpg", "https://xx.jpg", "1", "https://guide.jpg", "2", "/static.jpg"];
var filtered = str.filter(function (item) {
  return (parseInt(item) == item);
});
console.log(filtered);

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