使用javascript实现Iframe自适应高度

$(window.parent.document).find("#ContentIframe").load(function() {
                    var main = $(window.parent.document).find("#ContentIframe");
                    var thisheight = $(document).height();
                    if (thisheight < 800)
                        thisheight = 800;
                    main.height(thisheight);
                });

function setMainHeight() {

    var main = $(window.parent.document).find("#ContentIframe");
    var thisheight = $("body").height();
    if (thisheight < 800) { thisheight = 800; }
    main.height(thisheight+50);
   
    setTimeout(setMainHeight, 2000);
}