/*
onmousedown : 选择元素
onmousemove : 移动元素
onmouseup : 释放元素
*/
查看Demo:拖拽图片
function drag(obj) {
obj.onmousedown = function(ev) {
var ev = ev || event;
var disX = ev.clientX - this.offsetLeft;
var disY = ev.clientY - this.offsetTop;
if ( obj.setCapture ) {
obj.setCapture();
}
document.onmousemove = function(ev) {
var ev = ev || event;
obj.style.left = ev.clientX - disX + 'px';
obj.style.top = ev.clientY - disY + 'px';
}
document.onmouseup = function() {
document.onmousemove = document.onmouseup = null;
//释放全局捕获 releaseCapture();
if ( obj.releaseCapture ) {
obj.releaseCapture();
}
}
return false;
}
}
