如何用js按顺序显示5个div

Question

div1{display: none}
div2{display: none}
div3{display: none}
div4{display: none}
div5{display: none}

setTimeout(function){
var obj=document.getElementById("div1");
obj.style.display="inline";
},2000)

怎么按照1,2,3,4,5的div顺序依次显示
要有settimeout效果