TypeError: undefined is not an object

 

This question already has an answer here:

  • Detecting an undefined object property 40 answers

    • i tried like this and it seems to work 

    var iframe = document.querySelector('.container iframe');
window.frames[iframe.id].contentWindow.runAnimation();

    https://plnkr.co/edit/0pquvlK3beF1pqMcU1lc?p=preview

    链接地址: http://www.djcxy.com/p/22640.html

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