[Vue.js--axios.post to send form data to the background is empty object to solve the problem]

The data is transferred here in the form of objects, and the official document explains: By default, the data objects will be converted into JSON format and sent to the server. The format of the transferred data should be string format name=cxf&gender=
Official document:https://www.npmjs.com/package/axios

login(){
	let { username,password } = this;
	this.axios.post('/user/login.do',{
            headers: { 'content-type': 'application/x-www-form-urlencoded' }
        },
            {
                params: {username:username,password:password}
            }).then((res)=>{
					this.res = res;
					this.$router.push('/index');
				});
			},

You only need to add the declaration header, you can add it globally or in the method.

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