how to insert js to iframe page in order to disabled open new page/window

how to insert js to iframe page in order to disabled open new page/window

js 禁用 iframe 中的页面打开新页面

https://stackoverflow.com/questions/29188009/how-to-prevent-links-in-iframe-from-opening-in-new-tab#

demo

https://codepen.io/webgeeker/pen/bzdbmK
https://codepen.io/webgeeker/pen/mvJbzM

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iframe & HTTPS & CORS

https://iframe.xgqfrms.xyz/eapp/index.html#blog.sina.cn