HTML5加载旧版JS插件报错主因是执行时序、作用域隔离、API废弃及隐式依赖；需确保同步加载顺序、避免module作用域污染、替换document.write/eval/with、补全IE事件兼容、配置XHR credentials，并排查DOM就绪等隐式假设。
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