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script async属性使用方法
script标签的async属性用于指定脚本是否异步执行,若设置该属性则返回true,否则返回false。 1、 新建一个名为 script_async 的 HTML 文件。 2、 引入一个script脚本,设置其id为my_script_id_async,并添加async属性以实现异步加载。 3、 添加一个按钮,在其点击事件中调用自 ...
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