從字符串中刪除重複的單詞而不將其轉換爲數組

Question

我試圖在不將字符串轉換爲數組的情況下獲取常用單詞（來自兩個字符串）。下面的代碼是獲取並顯示常用詞，但問題是，此代碼不會刪除所有重複項，因爲它顯示所有常用詞而不刪除重複項。我嘗試搜索，但解決方案是使用split（）和filter（）。有沒有其他方法可以刪除重複項。

非常感謝。

function common() { 
 
    var str1 = "is hello and he is the only hello is" 
 
    var str2 = "is hello you and is and he and is the only"; 
 
    var min = 0; 
 
    var max = 0; 
 
    var count = 0; 
 
    var count1 = 0; 
 
    var count2 = 0; 
 
    var out = ''; 
 
    var out2 = ''; 
 
    var out3 = ''; 
 
    var len1 = str1.length; 
 
    var len2 = str2.length; 
 
    var output = ''; 
 
    var temp = 0; 
 
    var temp1 = 0; 
 
    for (m = 0; m < str1.length; m++) { 
 
    temp1 = 0; 
 
    if (str1.charAt(m) == " " || m == str1.length - 1) { 
 
     count1++; 
 
     if (m == str1.length - 1) { 
 
     out1 = str1.slice(temp, m + 1); 
 
     } else { 
 
     out1 = str1.slice(temp, m); 
 
     } 
 
     for (i = temp1; i < str2.length; i++) { 
 
     if (str2.charAt(i) == " " || i == str2.length - 1) { 
 
      if (i == str2.length - 1) { 
 
      out2 = str2.slice(temp1, i + 1); 
 
      } else { 
 
      out2 = str2.slice(temp1, i); 
 
      } 
 
      temp1 = i + 1; 
 
      if (out1 == out2) { 
 
      if (out3.indexOf(out1) == -1) { 
 
       out3 += out1 + ' '; 
 
      } else if (out3.indexOf(out1) >= 0) { 
 
       var r = out3.indexOf(out1); 
 
       while (out3.charAt(r) != " ") { 
 
       r++; 
 
       } 
 
       if (r != out1.length) { 
 
       out3 += out1 + ' '; 
 
       } 
 
      } 
 
      } 
 
     } 
 
     } 
 
     temp = m + 1; 
 
    } 
 
    } 
 
    console.log(out3); 
 
    out = document.getElementById("tarea3"); 
 
    out.value = out3; 
 
}

<textarea id="tarea"></textarea> 
 
<textarea id="tarea2"></textarea> 
 
<textarea id="tarea3"></textarea> 
 
<button type="button" onclick="common()">Run</button>

Answer 1

無陣列沒有正則表達式，你可以得到這樣的常用詞。其餘的由您的處理決定。

var str1 = "is hello and he is the only hello is", 
 
    str2 = "is hello you and is and he and is the only", 
 
    lut = {}, 
 
    stc = "", 
 
     i = 0; 
 

 
while (i <= str1.length) { 
 
    if (str1[i] !== " " && i < str1.length) { 
 
    \t stc+=str1[i++]; 
 
    } else { 
 
    \t lut[stc] = "unmatch"; 
 
    \t stc = ""; 
 
    \t ++i; 
 
    } 
 
} 
 

 
    i = 0; 
 
stc = ""; 
 
while (i <= str2.length) { 
 
    if (str2[i] !== " " && i < str2.length) { 
 
    \t stc+=str2[i++]; 
 
    } else { 
 
    \t lut[stc] = lut[stc] ? "common" : "unmatch"; 
 
    \t stc = ""; 
 
    \t ++i; 
 
    } 
 
} 
 
console.log(lut);