feat(tag): add pandown (#785)

Author: Fgaoxing

scripts/tags/pandown.js

@@ -0,0 +1,33 @@
+'use strict';
+
+// {% pandown type, url, pwd, fname %}
+hexo.extend.tag.register('pandown', function(args) {
+    if(/::/g.test(args)){
+        args = args.join(' ').split('::');
+    }
+    else{
+        args = args.join(' ').split(',');
+    }
+    let type = '';
+    let url = '';
+    let pwd = '';
+    let fname = '';
+    if (args.length < 4) {
+        return;
+    } else if (args[0].trim() === 'yun') {
+        return '<p>对不起，pandown-tags不支持自定义</p><br><p>Sorry, pandown-tags does not support customization</p>'
+    } else {
+        type = args[0].trim();
+        url = args[1].trim();
+        pwd = args[2].trim();
+        fname = args[3].trim();
+    }
+    let result = '';
+    // js
+    result += '<div class="tag pandown-tags"><script type="text/javascript" src="https://unpkg.com/pandown"></script>';
+    //pandown
+    result += '<pandown type="'+type+'" url="'+url+'" pwd="'+pwd+'" fname="'+fname+'"></pandown>'
+    //调用
+    result += '<script>pandown()</script></div>'
+    return result;
+});