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jQuery公司

> .tcDayTimes ,它将项目存储到 NodeList . 然后使用 .html() 更改所有这些元素的html。

$(".tblServices > tbody > .loc2 > .tcDayTimes").html("24 hours");

<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<table class="tblServices">
  <tbody>
    <tr class="name loc1">
      <td class="name">loc1</td>
      <td class="tcDayTimes">9-5</td>
      <td class="tcDayTimes">9-5</td>
    </tr>
    <tr class="name loc2">
      <td class="name ">loc1</td>
      <td class="tcDayTimes">9-5</td>
      <td class="tcDayTimes">9-5</td>
    </tr>
  </tbody>
</table>

普通Javascript

.querySelectorAll() 节点列表 (就像一个数组)。那你就可以用 .innerHTML

var elements = document.querySelectorAll(".tblServices > tbody > .loc2 > .tcDayTimes");

elements.forEach(e => {
  e.innerHTML = "24 hours";
});

<table class="tblServices">
  <tbody>
    <tr class="name loc1">
      <td class="name">loc1</td>
      <td class="tcDayTimes">9-5</td>
      <td class="tcDayTimes">9-5</td>
    </tr>
    <tr class="name loc2">
      <td class="name ">loc1</td>
      <td class="tcDayTimes">9-5</td>
      <td class="tcDayTimes">9-5</td>
    </tr>
  </tbody>
</table>

你不需要 > .tblServices tbody .loc2 .tcDayTimes ,但它看起来更整洁,如果我是你,我会把它放在那里。

你错过了 双引号结尾 在你的警觉中。我把它修好了你在下面的片段中。

注: 它是冗余包括jQuery 两次 ,所以去掉那个。(如果您两次包含jQuery的原因是因为它要求您在代码片段中包含jQuery,那么如果您已经从其他地方包含了它,就不必这样做了)。

$(document).ready(function() {
  alert("Welcome!");
});

background-color:Teal;

}
h1 {
  text-align: center;
  color: Gold;
  font-family: arial;
  font-size: 25pt;
}
#p1 {
  text-align: left;
  color: white;
  font-family: arial;
  font-size: 14pt;
  margin-top: 40px;
  margin-bottom: 20px;
  margin-left: 10px;
  margin-right: 300px;
}
#p2 {
  text-align: right;
  color: white;
  font-family: arial;
  font-size: 14pt;
  margin-top: 100px;
  margin-bottom: 20px;
  margin-left: 300px;
  margin-right: 10px;
}
#p3 {
  text-align: left;
  color: white;
  font-family: arial;
  font-size: 14pt;
  margin-top: 100px;
  margin-bottom: 20px;
  margin-left: 10px;
  margin-right: 300px;
}
#img1 {
  float: left;
  padding-right: 15px;
  width: 200px;
}
#img2 {
  float: right;
  padding-left: 15px;
  width: 200px;
}
a:link {
  color: gold;
  background-color: transparent;
  font-family: arial;
  text-decoration: none;
}
a:visited {
  color: gold;
  background-color: transparent;
  font-family: arial;
  text-decoration: none;
}
a:hover {
  color: white;
  background-color: transparent;
  font-family: arial;
  text-decoration: underline;
}
a:active {
  color: lime;
  background-color: transparent;
  font-family: arial;
  text-decoration: underline;
}

<!DOCTYPE html>
<html>

<head>
  <title>
    "Cute Cats"
  </title>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width, initial-scale=1">
  <link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.min.css">
  <script src="https://ajax.googleapis.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
  <script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/js/bootstrap.min.js"></script>
  <link rel="stylesheet" type="text/css" href="styles.css">
</head>

<body>
  <script src="script.js">
  </script>
  <h1> Cute Cats </h1>


  <p id="p1"> <img src="Tulip.jpg" alt="Cute Cat-Tulip" id="img1"> Find box a little too small and curl up with fur hanging out lick arm hair or sweet beast swat at dog, and chirp at birds that box? i can fit in that box. Spit up on light gray carpet instead of adjacent
    linoleum. Spill litter box, scratch at owner, destroy all furniture, especially couch find empty spot in cupboard and sleep all day, licks paws ptracy,intently sniff hand, or really likes hummus weigh eight pounds but take up a full-size bed. Chew
    the plant. Bleghbleghvomit my furball really tie the room together hiss and stare at nothing then run suddenly away and warm up laptop with butt lick butt fart rainbows until owner yells pee in litter box hiss at cats stretch, ooh, are those your
    $250 dollar sandals?

  </p>


  <p id="p2"> <img src="Tikki.jpg" alt="Cute Cat-Tikki" id="img2"> Slap kitten brother with paw spread kitty litter all over house, i could pee on this if i had the energy purr when being pet for nya nya nyan. Touch water with paw then recoil in horror eat all the
    power cords for chill on the couch table, annoy the old grumpy cat, start a fight and then retreat to wash when i lose so scratch me there, elevator butt refuse to come home when humans are going to bed; stay out all night then yowl like i am dying
    at 4am. Eat the rubberband the cat was chasing the mouse so demand to be let outside at once, and expect owner to wait for me as i think about it yet taco cat backwards spells taco cat furrier and even more furrier hairball for groom forever, stretch
    tongue and leave it slightly out, blep stand in front of the computer screen. Red light attracts my eyes, light must die, attack!

  </p>


  <p id="p3"> <img src="Maddi.jpg" alt="Cute Cat-Maddison" id="img1"> More napping, more napping all the napping is exhausting. Fish i must find my red catnip fishy fish who's the baby pet me pet me don't pet me scratch need to chase tail, but intently stare at the
    same spot, or i like frogs and 0 gravity. Meow to be let out thinking longingly about tuna brine or catasstrophe scratch, yet stare at wall turn and meow stare at wall some more meow again continue staring take a big fluffing crap cough hairball on
    conveniently placed pants. Lounge in doorway hiding behind the couch until lured out by a feathery toy. Sit on human give attitude, or meow go back to sleep owner brings food and water tries to pet on head, so scratch get sprayed by water because
    bad cat or lick butt. Stare at ceiling.

  </p>

</body>