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1.修复在火狐浏览器开启workerLoader时png图片显示异常的bug,已提交单元测试
2.修复在火狐浏览器调试libs/workerloader.js浏览器崩溃的bug
3.删除一些无用代码
4.fix: HTMLDivElement destroy时,HTMLDivParser及其子节点无法复用,以及子节点出现事件引用而无法被gc的可能