How does uniapp determine whether to connect to the external network?

1. Introduction

In development, we often need to judge the network connection status. For example, when developing using the Uniapp framework, we need to determine whether we are currently connected to the external network. Therefore, this article will introduce how to determine whether the Uniapp application is connected to the external network.

2. How does Uniapp determine whether to connect to the external network

The Uniapp framework provides a method to determine the network connection status. Through this method, we can determine whether the current network is connected to the external network.

1. Use the uni.getNetworkType() method to obtain the current network connection status.

This method returns multiple values, including information such as network connection type and whether to connect to the external network.

2. Determine whether to connect to the external network.

Through the "networkType" field returned by the uni.getNetworkType() method, we can determine whether the current network connection is "none". If so, "none" means that the network is not connected; if not, " none" means the network is connected. However, this method can only determine whether it is currently connected to the network, and cannot determine whether it is connected to the external network. We need to use other methods to determine whether to connect to the external network.

3. Use the uni.request() method to send a request.

We can determine whether the current network is connected to the external network by sending a request. If the external network cannot be connected, an error message will be returned.

Sample code:

uni.request({
    url: 'http://www.baidu.com/', // 这里以百度为例
    success: function(res) {
        console.log("网络状态正常");
    },
    fail: function(res) {
        console.log("网络状态异常");
    }
})

The above code will send a request to the Baidu server. If the network status is normal, the console will output "Network status is normal"; if the network status is not normal, the console will "Network status abnormal" is output.

4. Use the uni.showToast() method to prompt the user.

When judging the network status, we can use the uni.showToast() method to prompt the user for the current network status.

Sample code:

uni.request({
    url: 'http://www.baidu.com/',
    success: function(res) {
        uni.showToast({
            title: '网络状态正常',
            duration: 2000
        });
    },
    fail: function(res) {
        uni.showToast({
            title: '网络状态异常',
            duration: 2000
        });
    }
})

The above code will also send a request to the Baidu server. If the network status is normal, a prompt box will pop up, prompting "Network status is normal"; if the network status is abnormal , a prompt box will pop up, prompting "The network status is abnormal."

3. Summary

This article introduces how to determine whether the Uniapp application is connected to the external network. By using the uni.getNetworkType() method to obtain the current network connection status, and using the uni.request() method to send a request, we can determine whether the current network connection status is normal and prompt the user with relevant information. Hope this article can help everyone.

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