ajax 页面创建select option有value值

function makePayOption(pay,id){
var selects = document.getElementById("PAY");
var ops = document.createElement("option");
var vas = ops.createAttribute("vlue");
ops.appendChild(document.createTextNode(pay));
vas.appendChild(document.createTextNode(id));
selects.appendChild(ops);
}

var opt= new Option(caption, value);

selectObj.options.add(opt);