三元(目)运算符等于简单if else
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是一个三元运算符
上面的写法也就是以下的意思
if(i == cursel){
menu.className = "curr";
}else{
menu.className = "";
}
//
if(i == cursel){
con.style.display = "block";
}else{
con.style.display = "none";
}
menu.className = "curr";
}else{
menu.className = "";
}
//
if(i == cursel){
con.style.display = "block";
}else{
con.style.display = "none";
}