假设我有一个数组:a.indexOf([2,2])
如果我写一个[1],它返回[2,2]。但是,如果我想返回数组元素<html>
<head>
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.min.css">
<link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/font-awesome/4.7.0/css/font-awesome.min.css">
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.1.1/jquery.min.js"></script>
<script>
$("document").ready(function(){
$(".menu-button").click(function(){
$(".side-nav-menu").toggle(100);
});
});
</script>
</head>
<body>
<div class="container-fluid">
<div class="row">
<div class="col-md-0">
<div>
<a class="btn btn-default menu-button transparent-btn">
<i class="fa fa-bars fa-2x"></i>
<i class=""></i>
</a>
</div>
<div class="side-nav-menu btn-group-vertical" style="display:none">
<button class="btn btn-default transparent-btn btn-lg text-left">About</button>
<button class="btn btn-default transparent-btn btn-lg text-left">Schedule</button>
<button class="btn btn-default transparent-btn btn-lg text-left">Venue</button>
<button class="btn btn-default transparent-btn btn-lg text-left">Speakers</button>
<button class="btn btn-default transparent-btn btn-lg text-left">Contacts</button>
</div>
</div>
</div>
<div>
</body>
的索引,如{{1}},则返回-1,但未找到。有没有一种优雅的方法来查找数组中数组元素的索引?
答案 0 :(得分:1)
您可以使用Array.prototype.findIndex()
var index = a.findIndex(function(el) {
return el[0] == 2 && el[1] === 2
});
var index = a.findIndex(function(el) {
return el.every(function(n) {return n === 2})
});