Javascript悬停效果删除预定义的样式-Javascripthovereffectremovespredefinedstyle

If the original background color is specified via a stylesheet or (as in your case) a legacy bgcolor attribute, then you can just clear out the style on the element when you're done, and it'll revert:

如果原始背景颜色是通过样式表或(如你的情况下)传统的bgcolor属性指定的,那么你可以在完成时清除元素上的样式,它将还原:

function ChangeColor(tableRow, highLight)
{
  if (highLight)
  {
    tableRow.style.backgroundColor = '#dcfac9';
  }
  else
  {
    tableRow.style.backgroundColor = '';
  }
}

That said, you'd probably be better off using a CSS class and associated rules to represent the highlighted state of the row and add/remove that as you like:

也就是说,您可能最好使用CSS类和相关规则来表示行的突出显示状态,并根据需要添加/删除它:

tr { backgroundColor:  }
tr.highlighted { backgroundColor: #dcfac9 }

Then your Javascript becomes

然后你的Javascript就变成了

function ChangeColor(tableRow, highLight) {
    if(highLight) 
    {
        tableRow.className = 'highlighted';
    } 
    else 
    {
        tableRow.className = '';
    }
}

In addition to keeping specific styles out of your script and markup (where they become difficult to maintain over time), this lets you add or change hover styles (say, bold text, or a border) without adding complexity to the code.

除了将特定样式保留在脚本和标记之外(随着时间的推移它们变得难以维护),这使您可以添加或更改悬停样式(例如,粗体文本或边框),而不会增加代码的复杂性。

If you have access to a Javascript library such as Prototype, Ext.js or Dojo, then you can use their class manipulation functions instead, which will handle the case where you want to preserve an existing className, or are using multiple classes for on a single element.

如果您可以访问诸如Prototype,Ext.js或Dojo之类的Javascript库,那么您可以使用它们的类操作函数,它们将处理您希望保留现有className的情况,或者使用多个类来处理单个元素。