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.triangle-close{
display: inline-block;
width: 0;
height: 0;
border-left: 8px solid;
border-top: 4px solid transparent;
border-bottom: 4px solid transparent;
}
<div>
<ul>
<li class="level1">
<span class="triangle-close toggle" data-target="#level-con"></span>
<span class="theme">dddddd</span>
</li>
</ul>
<input class="btn" type="button" value="clickme" onclick="tt()">
</div>
function tt(){
var t = $(".theme").css("display");
console.log(t);
if(t == "none"){
$(".level1").children("span").css("display", "block");
$(".level1").children("span").css("float", "left");
}
else{
$(".level1").children("span").css("display", "none");
}
}
function tt(){
var t = $(".theme").css("display");
console.log(t);
if(t == "none"){
$(".level1").children("span").css("display", "inline");
}
else{
$(".level1").children("span").css("display", "none");
}
}