第一次提交：小程序前端最新版本

static/lib/EmojiDecoder.js

@@ -0,0 +1,25 @@
+class EmojiDecoder {
+    emojiMap = null;
+    url = "";
+    patterns = [];
+    metaChars = /[[\]{}()*+?.\\|^$\-,&#\s]/g;
+    decode = this.decode;
+
+    constructor(url,emojiMap) {
+        this.url = url || '';
+        this.emojiMap = emojiMap || {};
+        for (let i in this.emojiMap) {
+            if (this.emojiMap.hasOwnProperty(i)){
+                this.patterns.push('('+i.replace(this.metaChars, "\\$&")+')');
+            }
+        }
+    }
+
+    decode (text) {
+        return text.replace(new RegExp(this.patterns.join('|'),'g'),  (match) => {
+            return typeof this.emojiMap[match] != 'undefined' ? '<img height="20rpx" width="20rpx" src="'+this.url+this.emojiMap[match]+'" />' : match;
+        });
+    }
+}
+
+export default EmojiDecoder