Combinar arreglos con concat

let list = [{name:'小李',age:'12'},{name:'小明',age:'12'}]
let oldlist = [{name:'小花',age:'10'}]

list=list.concat(oldlist)

console.log(list) 
//[{name:'小李',age:'12'}, {name:'小明',age:'12'},{name:'小花',age:'10'}]