DOM事件探秘-QQ拖曳效果
function getByName(clsName,parent) {
var oParent = parent?document.getElementById(parent):document,
eles = [],
elements = oParent.getElementsByTagName('*');
for (var i=0;i<elements.length;i++) {
if (elements[i].className == clsName) {
eles.push(elements[i]);
}
return eles;
}
}
window.onload = drag;
function drag() {
var oTitle = getByName('login_logo_webqq','loginPanel')[0];
oTitle.onmousedown = fnDown;
}
function fnDown() {
var oDrag = document.getElementById('loginPanel')
document.onmousemove = function(event){
event = event || window.event;
oDrag.style.left = event.clientX+'px';
oDrag.style.top = event.clientY+'px';
}
}
DOM时间探秘里边照着视频打的，对了一遍没找到问题……控制台报错Cannot set property 'onmousedown' of undefined，不知道啥原因……望解答，谢谢！
