diff --git a/src/index.ts b/src/index.ts
index ad21821..a1eefea 100644
--- a/src/index.ts
+++ b/src/index.ts
@@ -1 +1,50 @@
-console.log("hello world")
\ No newline at end of file
+export default function (nodeClass: string) {
+  const nodes = document.querySelectorAll(`.${nodeClass}`)
+  for (let i in nodes) {
+    processText(nodes[i])
+  }
+}
+
+function processText(node: Node): void {
+  if (node.nodeType === Node.TEXT_NODE) {
+    // detect the characters includes chinese and english, or japanese (kanji or kana) and english
+    const reg = /[\u4e00-\u9fa5\u3040-\u30FF][a-zA-Z]|\w[\u4e00-\u9fa5\u3040-\u30FF]|\w[a-zA-Z]/
+    const text = node.nodeValue || ''
+    if (reg.test(text)) {
+      // process the text char by char
+      const textArr = text.split('')
+      let newText = ''
+      for (let i = 0; i < textArr.length; i++) {
+        const cnchar_and_kanji = /[\u4e00-\u9fa5\u3040-\u30FF]/
+        const kana = /[\u3040-\u30FF]/
+        const english_and_number = /[a-zA-Z0-9]/
+        // if the char is chinese or japanese (kanji or kana)
+        if (cnchar_and_kanji.test(textArr[i]) || kana.test(textArr[i])) {
+          console.log(`textArr[i]: ${textArr[i]}`)
+          // if next char is english
+          if (/[a-zA-Z]/.test(textArr[i + 1])) {
+            console.log(`textArr[i + 1]: ${textArr[i + 1]}`)
+            // 1/8 em space
+            newText += textArr[i] + '\u2009'
+          } else {
+            newText += textArr[i]
+          }
+        } else if (english_and_number.test(textArr[i])) {
+          if (cnchar_and_kanji.test(textArr[i + 1]) || kana.test(textArr[i + 1])) {
+            newText += textArr[i] + '\u2009'
+          } else {
+            newText += textArr[i]
+          }
+        } else {
+          newText += textArr[i]
+        
+        }
+      }
+      node.nodeValue = newText
+    }
+  } else {
+    if (!node.nodeName) return
+    console.log(node.nodeName)
+    for (let i = 0; i < node.childNodes.length; i++) processText(node.childNodes[i])
+  }
+}
diff --git a/tsconfig.json b/tsconfig.json
index 2414f2f..3fb76d6 100644
--- a/tsconfig.json
+++ b/tsconfig.json
@@ -1,7 +1,7 @@
 {
   "compilerOptions": {
-    "target": "es5",
-    "module": "commonjs",
+    "target": "es6",
+    "module": "es6",
     "declaration": true,
     "outDir": "./dist",
     "strict": true