var list = [],

    n = 0;

while(true) {

    n++;

    list.push(document.createElement('div'));

    node.setAttribute("class", "test");

    node.innerText = "test";

    if(n===10000) 

        break;

}

var list = [],

    n = 0,

    node = document.createElement('div');

    node.setAttribute("class", "test");

    node.innerText = "test";

while(true) {

    n++;

    var clone = node.cloneNode(true);

    node.setAttribute("class", "clone");

    node.innerText = "clone";

    list.push(clone);

    if(n===10000) 

        break;

}