vue determines whether it is an ie browser

Vue is a popular JavaScript framework that is widely used in web development. It provides an easy way to create interactive front-end interfaces with cross-browser compatibility. However, sometimes you need to detect the user's browser type in the code, especially IE browser, because its compatibility often causes trouble. This article will introduce how to use Vue to determine whether the user is using IE browser.

First, we need to know how to detect the user's browser type. In the browser, we can obtain browser information through the navigator.userAgent property. It returns a string containing browser manufacturer, version number, operating system and other information. For example, in IE 11, the return value of navigator.userAgent looks like this:

"Mozilla/5.0 (Windows NT 10.0; WOW64; Trident/7.0; AS; rv:11.0) like Gecko"

As you can see, it contains the string Trident/7.0, which is the identifier of the IE browser.

So, how to get the navigator.userAgent value in Vue? We can use Vue's life cycle hook function created or mounted to obtain it. These two functions are called when a Vue component instance is created or mounted into the DOM.

In the Vue component, we can get the value of navigator.userAgent like this:

export default {
  created() {
    const userAgent = navigator.userAgent;
    console.log(userAgent);
  },
};

This code snippet will output the userAgent value of the current user's browser when the Vue component is created. You can control it by Check the value on the platform.

However, this value is not very friendly. It is a string containing a lot of information. Therefore, we need to parse it to determine whether the current user is using IE browser.

Before parsing, we need to pay attention to changes in the user agent value of the IE browser. Due to the poor compatibility of IE, many developers will write specific code to determine whether the browser is IE. However, the user agent value of IE browser can be modified. For example, in IE11, users can modify the user agent value through F12 Developer Tools -> Emulation -> User agent string, which will change the user agent value passed by the browser to the server. Therefore, a more reliable method should be used to determine whether the browser is IE.

The most common method is to use the ActiveXObject object unique to IE browser to judge. ActiveXObject is an API used to create COM objects in IE browsers and is not supported by other browsers. Therefore, if you try to create an ActiveXObject object in a non-IE browser, an error will be thrown. We can use this feature to determine the browser type.

The implementation in the Vue component is as follows:

export default {
  data() {
    return {
      isIE: false,
    };
  },
  created() {
    const isIE = !!window.ActiveXObject || "ActiveXObject" in window;
    this.isIE = isIE;
  },
};

In this code snippet, we take advantage of the features of ECMAScript 5. Using the in operator in non-IE browsers to determine whether ActiveXObject exists will return false. . At the same time, we used the !! double exclamation mark to convert the result into a boolean value to be stored in Vue's data attribute.

Finally, in the Vue component, we can execute the corresponding logic based on the value of the isIE variable to determine whether it is an IE browser. For example, you can use v-if to hide or show IE-specific styles.

<template>
  <div>
    <h1 v-if="!isIE">非 IE 浏览器</h1>
    <h1 v-else>IE 浏览器</h1>
  </div>
</template>

Through the above method, we can obtain the user's browser information in the Vue code and determine whether the user uses the IE browser. This is very useful for front-end developers, because the specific compatibility issues of IE browser must be considered in many projects.

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