将html压缩的语句

combine: function () {
    var html = '';
    html += document.getElementById('header-template').innerHTML;
    html += document.getElementById('html').innerHTML;
    html += document.getElementById('footer-template').innerHTML;
    document.getElementById('frame').contentWindow.document.body.innerHTML = html.replace(/[
	]/ig, ' ').replace(/s+/ig, ' ');
},