How to use v-html to render HTML code in Vue

In the Vue framework, we usually use template syntax to render dynamic data in the page. However, in some cases, we need to render some HTML code, and in this case we need to use the v-html directive.

The v-html directive can render data directly into the page as HTML code, which is equivalent to bypassing Vue's template compilation and directly inserting HTML code into the page. This command is very powerful, but it also needs to be used with caution, because if the data contains malicious scripts or tags, it will lead to XSS vulnerabilities.

Next, let’s take a look at how to use the v-html directive in Vue.

First of all, using the v-html directive in Vue needs to meet two conditions:

1. The data must be a string.
2. The HTML code contained in the data must be trustworthy and not cause security issues.

Only when the above two conditions are met, the v-html directive can be used safely.

The following is a simple example that demonstrates how to use the v-html directive:

<template>
  <div v-html="htmlCode"></div>
</template>

<script>
export default {
  data() {
    return {
      htmlCode: '<p style="color: red;">Hello World!</p>'
    }
  }
}
</script>

In the above example, we store a paragraph tag containing styles as a string in the Vue instance data object, and bind this string to the div element of the page. Since the value of htmlCode is a string, the HTML code in this string can be directly rendered into the page using the v-html directive.

We can see that a red Hello World! will be displayed on the page.

It should be noted that when using the v-html directive, you need to ensure that the source of the data is trustworthy. If the data comes from external factors such as user input or network requests, data filtering and verification need to be performed first to avoid XSS vulnerabilities.

To summarize, the v-html command is very convenient to use. You can directly insert data into the page as HTML code. However, due to security factors, it must be used with caution to ensure that the data source is legal and credible and does not cause security issues.

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