如何用JS压缩字符串？

Question

尝试编写用于压缩字符串的功能(2个相等的字母变为1)。不要知道如何保存压缩的进度(尝试不同的组合与concat -不成功)。每次我的for取全字符串CodePen

​

let pass = '1122333456';

function CompressPass(string) {
  for (let i = 0; i < string.length; i++) {

    let concisePassword = string.split('');
    const item = string[i];
    const nextItem = string[i + 1];
    console.log(+item, +nextItem);

    if (item === nextItem) {
      concisePassword.splice(i, 1);
      console.log(concisePassword);
    } else {
      console.log('not equal: ', +item, +nextItem);
    }
  };
}
CompressPass(pass);

​

Answer 1

也许这对你有帮助

​

let pass = '11223322345666600222222';
function CompressPass (string) {
  string += '-';
  let str = '';
  for (let i = 1; i < string.length; i++) {
    const nextItem = string[i];
    const item = string[i - 1];
     if (item != nextItem){
      str += item;
     }
  };
  return str;
}
console.log(CompressPass(pass))

​

Answer 2

您可以尝试'lz- string‘来压缩和解压javascript中的字符串。

**我使用它来压缩本地存储数据(因为本地存储只有5MB的限制)

**对于较短的字符串，结果可能不可见，但您可以尝试。

链接：https://pieroxy.net/blog/pages/lz-string/index.html

示例：(来自上述链接)

<script language="javascript" src="lz-string.js"></script>

<script>
   var string = "This is my compression test.";
   alert("Size of sample is: " + string.length);

   var compressed = LZString.compress(string);
   alert("Size of compressed sample is: " + compressed.length);

   string = LZString.decompress(compressed);
   alert("Sample is: " + string);
</script>