前端 HTML5 + JS Escapers
HTML5 在解析标签<script>时可能会出现以下三种数据状态：
- script data escaped dash dash state;
- script data escaped state;
- script data double escaped state.
其中处于 escaped state 与 double escaped state 的状态会被当做 js 语句执行。 具体到标签中：
<script type = "text/javascript">
<!-- script data escaped dash dash state
this is script data escaped state
<script> this is script data double escaped state
</script>
this is script data escaped state
-->
< /script>
HTML5 解析器在<script></script>标签中解析到<!--时候，会进入到 dash dash escaped state，哪怕是<!--出现在 js 的字符串中,如下
<script>
if(console.log("<!--var a;<script>")</script>/)
alert("script data state");
else
alert("script data state too");
-->
</script>
上述代码的运行结果为：
控制台输出<!--var a;<script>
弹窗弹出 script data state too
不会出现 js 错误信息。
说明：
<!--触发的状态会持续到遇到>为止，上面的代码如果不加<script>，那么<!--就会因为遇到</script>中的>而结束。
如果不加-->那么 js 会运行到 HTML5 文档的最末尾 EOF 结束，从而导致解析错误。
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