Vue multiple spans set font size and color respectively-Front-end Q&A-php.cn

Vue multiple spans set font size and color respectively

王林

Release： 2023-05-18 10:21:37

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Vue is a popular JavaScript framework that allows developers to easily build interactive web applications. In Vue, we can use the v-bind and v-style directives to set CSS styles for HTML elements. In this article, we will learn how to use Vue to set the font size and color of multiple span elements.

First, let’s take a look at the HTML code:

<div id="app">
  <span v-bind:style="{fontSize: fontSize1, color: color1}">这是第一个span。</span>
  <span v-bind:style="{fontSize: fontSize2, color: color2}">这是第二个span。</span>
  <span v-bind:style="{fontSize: fontSize3, color: color3}">这是第三个span。</span>
</div>

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In the above code, we have a div element with 3 span elements, each span element has a different Font size and color. To style these elements, we need to define the values of these styles in the Vue instance. The following is the code for the Vue instance:

var app = new Vue({
  el: "#app",
  data: {
    fontSize1: "16px",
    fontSize2: "20px",
    fontSize3: "24px",
    color1: "red",
    color2: "green",
    color3: "blue",
  },
});

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In the above code, we defined 6 different variables, each variable corresponding to the font size and color of each span element. We can use a variable name like fontSize1 to reference each variable and bind it to the style attribute of each span element in the Vue template. Using the v-bind directive, we can dynamically bind the values of these variables into the style. This means that if we change any of these variables in the Vue instance, the corresponding span element will reflect those changes.

The following is a complete code example:

<!DOCTYPE html>
<html>
  <head>
    <title>Vue多个span元素样式设置</title>
  </head>
  <body>
    <div id="app">
      <span v-bind:style="{fontSize: fontSize1, color: color1}">这是第一个span。</span>
      <span v-bind:style="{fontSize: fontSize2, color: color2}">这是第二个span。</span>
      <span v-bind:style="{fontSize: fontSize3, color: color3}">这是第三个span。</span>
    </div>

    <script src="https://cdn.jsdelivr.net/npm/vue/dist/vue.js"></script>
    <script>
      var app = new Vue({
        el: "#app",
        data: {
          fontSize1: "16px",
          fontSize2: "20px",
          fontSize3: "24px",
          color1: "red",
          color2: "green",
          color3: "blue",
        },
      });
    </script>
  </body>
</html>

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In this example, we use CDN to load the Vue.js library. You can also download a local version of Vue.js and reference it using a local path similar to the following code:

<script src="vue.js"></script>

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Now we can open this example in a browser and try changing the font size and color value. When you change these values, each span element will change with it. This is the power of Vue: using Vue, we can update the style of the web application in real time, avoiding cumbersome event handling between HTML and JavaScript.

Summary

In this article, we introduced how to use Vue to set the font size and color of multiple span elements. By dynamically binding variables in the Vue instance to the style attribute of each span element, we can achieve the powerful function of updating web application styles in real time. Vue is becoming increasingly popular in web development, providing easy-to-use and flexible tools that make it easier for web developers to build interactive web applications.

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