JS异步加载和延迟加载

原創 michael8512 2020-02-23 06:16

1、异步加载的方案： 动态插入script标签  

1）通过ajax去获取js代码，然后通过eval执行  

2）script标签上添加defer或者async属性  

3）创建并插入iframe，让它异步执行js  


2、延迟加载：有些 js 代码并不是页面初始化的时候就立刻需要的，而稍后的某些情况才需要的。

1）使用setTimeout延迟方法加载时间，给网页加载留出等多时间

2）让js最后加载

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