<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>ajax file</title>
<script src="./js/jquery-1.12.4.min.js"></script>
<script>
$(function(){
// 是否有值,如果有值为true 否则为false
if($(".bloo").text()){
alert("heiheihei")
}else{
alert("++++++++++")
}
});
</script>
</head>
<body>
<div class="box" a="">
嘿嘿
</div>
<input type="text" value="嘿嘿">
<div class="bloo">嘿嘿</div>
</body>
</html>
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