javascript-tutorial
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diff --git a/‎1-js/02-first-steps/04-variables/article.md
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diff --git a/‎1-js/02-first-steps/10-ifelse/2-check-standard/ifelse_task2.png
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diff --git a/‎1-js/02-first-steps/10-ifelse/2-check-standard/task.md
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@@ -75,7 +75,7 @@ JavaScript 的能力依赖于它执行的环境。例如：[Node.js](https://wik
   这个限制也是为了用户的信息安全。例如，用户打开的 `http://anysite.com` 网页的 JavaScript 不能访问 `http://gmail.com`（另外一个标签页打开的网页）也不能从那里窃取信息。
 - JavaScript 通过互联网可以轻松地和服务器（当前网页域名的服务器）通讯。但是从其他网站/域的服务器中获取数据的能力是受限的，需要服务器（在 HTTP 头中）添加某些参数。这也是为了用户的数据安全。
 
-![](limitations.png)
+![](limitations.svg)
 
 浏览器环境外的 JavaScript 一般没有这些限制。例如服务端的 JavaScript 就没有这些限制。现代浏览器还允许通过 JavaScript 来安装浏览器插件或扩展，当然这也是在用户授权的前提下。
 
 
@@ -99,7 +99,7 @@ let user = 'John'
 
 例如，变量 `message` 可以被想象成一个标有 `"message"` 的盒子，在盒子里面，有一个值为 `"Hello!"`：
 
-![](variable.png)
+![](variable.svg)
 
 我们可以在盒子内放入任何值。
 
@@ -116,7 +116,7 @@ alert(message);
 
 当值改变的时候，先前的数据就从变量中删除了。
 
-![](variable-change.png)
+![](variable-change.svg)
 
 还可以声明两个变量，然后将其中一个变量的数据拷贝进另一个变量。
 
 
@@ -8,7 +8,7 @@ importance: 2
 
 如果访问者输入了 "ECMAScript"，输出就提示 "Right!"，否则 — 输出："Didn't know? ECMAScript!"
 
-![](ifelse_task2.png)
+![](ifelse_task2.svg)
 
 [示例 src="ifelse_task2"]