window.onload=function(){ nav=document.getElementById('nav'); share=document.getElementById('share'); flag=0; share.onmouseover=function(){ share.style.background='rgba(120,0,0,0.8)'; } share.onmouseout=stopFun; share.onclick=function(){ if (flag==0) { setInterval(play,30); clearInterval(play); flag=1; }else{ setInterval(stop,30); clearInterval(stop); flag=0; } } function play(){ nav.style.left=nav.offsetLeft+10+'px'; if (nav.offsetLeft>=0) { nav.style.left=0; } } function stop(){ nav.style.left=nav.offsetLeft-10+'px'; if (nav.offsetLeft<=-132) { nav.style.left=-132+'px'; } } }function stopFun(){ share.style.background='gray';}这是用来实现点击按钮弹出一个侧框,再次点击复原,但是却复原不了
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