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异步加载 js 脚本的方法有哪些？ #5

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into-piece opened this issue Jun 20, 2019 · 0 comments

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into-piece commented Jun 20, 2019

动态创建script标签，可通过script的onreadyState监视加载。
html5新增的async属性：可跟其他内容并行下载，限制ie9以上，只能加载外部js脚本。
html4的defer，作用与async相同，兼容更好一点，但async只要加载完可立即执行，defer需等待在dom加载完毕后执行，在window.onload之前，其他没有添加defer属性的script标签之后。
利用XHR异步加载js内容并执行。
iframe方式。

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