js converts string data to binary

erCode(str) {

      let result = [];

      let list = str.split("");

      for (var i = 0; i < list.length; i++) {

        if (i != 0) {

          result.push(" "); // Separate each item with a space (except the first item)

        }

        let item = list[i];

        let binaryStr = item.charCodeAt().toString(2); //Binary conversion

        result.push(binaryStr);

      }

      return result.join(""); //Convert the spliced ​​binary array into a string

    },