当document height 发生变化时事件是什么

Question

当document height发生变化时的事件是什么，resize只能用于window吗？

Answer 1

function onElementHeightChange(elm, callback){    var lastHeight = elm.clientHeight, newHeight;    (function run(){        newHeight = elm.clientHeight;        if( lastHeight != newHeight )            callback();        lastHeight = newHeight;        if( elm.onElementHeightChangeTimer )            clearTimeout(elm.onElementHeightChangeTimer);        elm.onElementHeightChangeTimer = setTimeout(run, 200);    })();}onElementHeightChange(document.body, function(){    alert('Body height changed');});