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function layer_show(layer_name){
if(document.getElementById(layer_name).style.visibility=='hidden'){
document.getElementById(layer_name).style.visibility="visible";
}
else{
document.getElementById(layer_name).style.visibility="hidden";
}
}
<dt class="title" onclick="layer_show('dt_text')" > <strong> <a href="#" class="B" > aaaaaaaaaaa</a>
</strong> <span class="time"> ssssssssssss </span> <span class="switch"> </span>
</dt>
<dd id="dt_text" style="visibility:hidden; overflow:auto; position:absolute">
……一些内容
</dd>
function layer_show(layer_name,action){
var v = document.getElementById(layer_name).style.visibility;
if(v=="hidden"){
document.getElementById(layer_name).style.visibility="visible";
}else if(v=="visible"){
document.getElementById(layer_name).style.visibility="hidden";
}
}