Edit in JSFiddle

'use strict';
var stringList = [
    'hello 1',
    'hello 2',
    'hello 3',
    'hello 4',
    'hello 5'
];

var Say = function(string) {
    var content = string;
    var hello =  function (){
        return content;
    };
    return {
    	hello: hello
    };
};

var container = document.querySelector("#container");

while (stringList.length > 0) {
    var str = stringList.shift();
	var btn = document.createElement("BUTTON");
    btn.appendChild(document.createTextNode(str));
    let say = new Say(str);
    console.log(say.hello());
    btn.onclick = function() {
        alert(say.hello());
    };
    container.appendChild(btn);
}

<div id='container'></div>