.show {display: block;}
.hide {display: none;}
<div class="leftmenus">
<span class="btn ng-binding azjcc cur" onclick="eventOne('zjcc')">资金余额</span>
<span class="btn ng-binding adqwt" onclick="eventOne('dqwt')">撤单(F3)</span>
<span class="btn ng-binding alswt" onclick="eventOne('lswt')">历史委托</span>
</div>
<div class="zjcc show">1</div>
<div class="dqwt hide">2</div>
<div class="lswt hide">3</div>
function eventOne(pid){
var list = ['zjcc','dqwt','lswt'];
for(var i=0;i<3;i++){
if(list[i] == pid){
document.querySelector('.a'+list[i]).classList.add('cur');
document.querySelector('.'+list[i]).className = list[i] + ' show';
}else{
document.querySelector('.a'+list[i]).classList.remove('cur');
document.querySelector('.'+list[i]).className = list[i] + ' hide';
}
}
}