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src/page.js

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+import React, { Component } from 'react';
+
+export default class Page extends Component {
+	setTitle(title) {
+		if(title) {
+			document.title = title;
+		}
+	}
+	setDescription(description) {
+		this.setMetaTag('description', description);
+	}
+	setMetaTag(name, content) {
+		const head = document.getElementsByTagName('head')[0];
+		const headChilds = head.children;
+		let meta;
+		for(let i = 0; i < headChilds.length; i++) {
+			if(headChilds[i].nodeName.toLowerCase() == 'meta' && headChilds[i].name.toLowerCase() == name) {
+				meta = headChilds[i];
+				break;
+			}
+		}
+		if(!meta) {
+			meta = document.createElement('meta');
+			head.appendChild(meta);
+		}
+		meta.name = name;
+		meta.content = content;
+	}
+}