无法读取未定义的属性“backgroundColor" [英] Cannot read property 'backgroundColor' of undefined

问题描述

当下面的函数调用运行时，它返回这个错误.未捕获的类型错误:无法读取属性 'backgroundColor'未定义"我正在尝试更改名为的类的背景颜色.jumbotron.到目前为止，我已经尝试了所有我能做的事情.

When the function call below gets run it returns this error. "Uncaught TypeError: Cannot read property 'backgroundColor' of undefined" I am trying to change the background color of a class called .jumbotron. I have tried everything I can thing of so far.

Could anyone tell me why this is happening?

clrElementJumbo("cornsilk");

function clrElementJumbo(scolor) {
  var el = document.getElementsByClassName("jumbotron");
  el.style.backgroundColor = scolor;
}

推荐答案

尝试替换代码

       var el = document.getElementsByClassName("jumbotron");

以下内容

       var el=document.getElementsByClassName("jumbotron")[0];

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