mousedown、mouseup、click执行顺序是从左到右的，更重要的是一旦mousedown事件激活，正常情况下后面两个事件也肯定会被激活
mousemove 事件在是一直在元素上运行的（如果加上的话）
<!DOCTYPE html><html><head><meta http-equiv="content-type" content="text/html;charset=UTF-8"/><title>mousedown mouseup click触发顺序</title></head><body><div id="div1"onmousedown="mouseDownFun();"onmouseup="mouseUpFun();"onclick="clickFun();"style="background:#CCC; border:3px solid #999; width:200px; height:200px; padding:10px;overflow-y: scroll"></div><input style="margin-top:10px" type="button" onclick="document.getElementById('div1').innerHTML='';" value="清除信息"/><script type="text/javascript">var div1 = document.getElementById('div1');function mouseDownFun() {div1.innerHTML += Math.random() + '<br/>';div1.innerHTML += 'mouseDown<br/>';}function mouseUpFun() {div1.innerHTML += 'mouseUp<br/>';}function clickFun() {div1.innerHTML += 'click<br/>';div1.scrollTop = div1.scrollHeight; //滚动到底部}</script></body></html>
