Fix bug 580

app/static/js/word_operation.js

@@ -93,7 +93,9 @@ function parseWord(element) {
     const word = element
         .querySelector("a.btn.btn-light[role=button]")  // 获取当前词频元素的词汇元素
         .innerText  // 获取词汇值;
-    const freq = Number.parseInt(element.querySelector(`#freq_${word}`).innerText);   // 获取词汇的数量
+    let freqId = `freq_${word}`;
+    freqId = CSS.escape(freqId); // for fixing bug 580, escape the apostrophe in the word
+    const freq = Number.parseInt(element.querySelector("#"+freqId).innerText);   // 获取词汇的数量
     return {
         word,
         freq