怎么判断对象组内是否有对象拥有该属性？

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怎么判断对象组内是否有对象拥有该属性？How to judge whether there is an object in the object group that has the attribute?

For example, here, I define a set of object groups in data. There are three objects corresponding to account and password respectively. How can I write a function in JS file to judge whether the user name entered by the user (assuming Xiao Ming) already exists in this object group? (i.e. whether the existing object is called Xiaoming) I haven't found this solution online... It's very uncomfortable

回答：

const res = student_list.some(item=>item.username==='张三');console.log(res); // true | false

student_list.find(item => item.username == "张三")