控制台报错 var oelements = parent.getElementsByTagName('*');

;

Uncaught TypeError: Cannot read property 'getElementsByTagName' of null

    at getByClass (瀑布流原生js代码.htm:51)

    at waterfall (瀑布流原生js代码.htm:44)

    at window.onload (瀑布流原生js代码.htm:38)