Question

我要在其中添加一些后缀的数组值：

var arr = ["folder1/1.jpg","folder2/2.png","foldern/some.jpg"];

添加前缀'_ thumb'应该会导致以下结果：

newArr = ["folder1/1_thumb.jpg","folder2/2_thumb.png","foldern/some_thumb.jpg"];

这是我的代码，但是不好：

var arr = ["folder1/1.jpg", "folder2/2.png", "foldern/some.jpg"];
  var newArr = [];
  arr.forEach(image => {
    var onlyPath = path.dirname(image);
    var filename = path.basename(image).split('.');
    newArr.push(onlyPath + '/' + filename[0] + '_thumb' + '.' + filename[1]);
  });
  console.log(newArr);

Answer 1

使用此：

  var arr = ["folder1/1.jpg","folder2/2.png","foldern/some.jpg"];
      var newArr = [];
      arr.forEach(filename => {
        var name = filename.split('.').slice(0, -1).join('.')+'_thumb.'+filename.split('.').pop();
        newArr.push(name);
        console.log('name ',name );
      });

Answer 2

您可以使用Array.map

let arr = ["folder1/1.jpg","folder2/2.png","foldern/some.jpg"];
let newArr = arr.map(img => img.split('.').join('_thumb.'));
console.log(newArr)

Answer 3

如果您在数组中具有不同的扩展名（例如.png，.jpeg等），则此选项非常适用

调用数组的每个元素。
相对于点（“。”）分割当前元素。
在分割后的元素的数组结果之间合并所需的字符串（“ _thumb”）。

var arr = ["folder1/1.jpg","folder2/2.png","foldern/some.jpg"];
    for (var i = 0; i < arr.length; i++) {
      var splitted_string = arr[i].split(".");
      arr[i] = splitted_string[0]+"_thumb."+splitted_string[1];
      console.log(arr[i]);
    }

Answer 4

尝试：

 arr.map(function(el) {
  return el.replace(/\./g,"_thumb.")
})

Answer 5

使用split()。这很简单。 ew;）

let arr = ["folder1/1.jpg","folder2/2.png","foldern/some.jpg"];
let newArr = arr.map(img => img.split('.')[0] + '_thumb.' + img.split('.')[1]);
console.log(newArr)

Answer 6

下面给出的代码可以为您提供帮助。它会在扩展名“ .xxx”之前插入给定的（_thumb）字符串

//function to run
function test()
    {
      var arr = ["folder1/1.jpg","folder2/2.png","foldern/some.jpg"];
      var newArr=[];

      for(i in arr)
      {
      //gets the index of "." sign to add the "_thumb" string before it
      var pos=arr[i].indexOf(".");
      var newVal=insert(arr[i], pos, "_thumb");
      newArr.push(newVal);

      }

    }

    //inserts the given string ("_thumb") between the array value
    function insert(str, index, value) {
        return str.substr(0, index) + value + str.substr(index);
    }

添加字符串文件的字符串后缀

6 个答案: