var FlyWeight = function() {
    var created = [];
    function create() {
        var dom = document.createElement('div');
        document.getElementById('container').appendChild(dom);
        created.push(dom);
        return dom;
    }
return {
    getDiv : function() {
        if (created.length > 5) {
        var div = created.shift();
        created.push(div);
        return div;
        } else {
            return create();
        } 
    }
}
}();
var paper = 0,num = 5,len = article.length;
for(var i = 0; i < 5; i++) {

if (article[i]) {

FlyWeight.getDiv().innerHTML = article[i];

}

}
document.getElementById('next_page').onclick = function() {

if (article.length < 5)

return;

var n = ++paper * num % len,j = 0;

}

避免对象间拥有相同内容造成多余开销