The most powerful function of Riot.js is custom tags. First, let’s take a piece of code and see the effect:
[code]<!Doctype html>
<html>
<head>
<meta charset="utf-8" />
<script type="text/javascript" src="riot.js"></script>
<script type="text/javascript" src="compiler.js"></script>
</head>
<body>
<!-- 调用自定义标签 -->
<timer start="10"></timer>
</body>
<!-- 最前面一定要有空格或TAB，留意它的type -->
<script type="riot/tag">
<timer>
<h3 id="Times-nbsp-nbsp-index-nbsp">Times: { index }</h3>
this.index = opts.start || 0;
var self = this;
tick(){
// 每个1秒，index自增
this.index++;
// 调用this.update更新UI【最欣赏这个了，能自己控制】
this.update();
}
var timer = setInterval(this.tick, 1000);
</timer>
</script>
<!-- 调用riot，启动自定义标签timer -->
<script type="text/javascript">
riot.mount("timer");
</script>
</html>The effect is as follows [for every 1 second, the value of times is +1] ：
![riot.js learning [1] Custom tags](https://img.php.cn//upload/image/747/752/840/1484553524645850.png?x-oss-process=image/resize,p_40 "1484553524645850.png")
Let’s talk about the pitfalls that newcomers will encounter:
script type=”riot/tag”
compiler It will traverse all elements with script type="riot/tag". If the script has src, the external file will be loaded. If there is no src, the content in the script will be compiled.
PS: The content written in the script must start with a space or tab. If it is directly followed by "
This is related to its internal parser [It was quite confusing the first time...]
tick()
The this object of this function is the current customization The context of the label, as long as the function declared like xx(){}, the context is specified as the context of the label
The tick function can be accessed through this.tick
this.update
This.update(); must be called before the content of the UI will be updated.
You may feel that there is no other MV* engine automation, but manual control of return will be more flexible
opts
In the code, there is a very strange variable opts:
[code]this.index = opts.start || 0;In fact, its value is this.opts, which is the attribute passed in by the custom tag.
For example:
[code]<timer start="10"></timer>Then this.opts.start/opts.start is equal to 10
{ index }
riot.js is a powerful value reading method, which supports simple expressions. Three-dimensional judgment. But there is a pitfall. In {}, single quotes \' should be used instead of double quotes\", otherwise it is super easy to make parsing errors.
Like { index || 10 }, { index > 10 ? 'Old man' : '小}, all can be supported
Supports referencing external tag definition files
[code]<script src="todo.tag" type="todo/tag"></script>
##The content and compilation of todo.tag can be written according to the above example. The above is the content of riot.js [1] custom tag, more details. For more related content, please pay attention to the PHP Chinese website (www.php.cn)!
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