改写为es6语法，解决在新版Aframe框架中的报错

[JetsomMa]

What kind of change does this PR introduce? (check at least one)

• Bugfix (non-breaking change which fixes an issue)
• Feature (non-breaking change which adds functionality)
• Code style update
• Refactor (refactoring or adding test which isn't a fix or add a feature)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Build-related changes
• [ * ] Other, please describe: change the code to ES6, solve Aframe error

Does this PR introduce a breaking change? (check one)

• Yes
• [ * ] No

Did you test your solution?

• [ * ] I lightly tested it in one browser
• I deeply tested it in several browsers
• I wrote tests around it (unit tests, integration tests, E2E tests)

Problem Description

在Aframe框架中有一个a-text组件用到了我们的代码，但是新版的aframe有了一些ES6特性，其与我们现在代码的写法不兼容，所以做出改变

Solution Description

将ES5的写法改为了ES6语法糖的class写法

Side Effects, Risks, Impact

• N/A

只在Aframe框架中测试通过，对其他框架的副作用，目前尚不清楚

Aditional comments: