我需要在以下对象中创建一个包含所有键（而不是值）的数组，其中键以下划线开头......
在下面的代码片段中我试图得到getSubscriptions()回来["_foo1", "_foo2"]
let myObj = {
foo0: 'test',
_foo1: 'test',
_foo2: 'test',
foo3: 'test',
};
function getSubscriptions(obj, cb) {
// should return ["_foo1", "_foo2"]
let ret = ["foo1", "_foo2"];
return cb(ret);
}
getSubscriptions(myObj, (ret) => {
if (match(ret, ["_foo1", "_foo2"]) ) {
$('.nope').hide();
return $('.works').show();
}
$('.nope').show();
$('.works').hide();
});
function match(arr1, arr2) {
if(arr1.length !== arr2.length) { return false; }
for(var i = arr1.length; i--;) {
if(arr1[i] !== arr2[i]) { return false;}
}
return true;
}
body {
background: #333;
color: #4ac388;
padding: 2em;
font-family: monospace;
font-size: 19px;
}
.nope {
color: #ce4242;
}
.container div{
padding: 1em;
border: 3px dotted;
}
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<div class="container">
<div class="works">It Works!</div>
<div class="nope">
Doesn't Work...</div>
</div>
您可以使用对象.keys https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/keys and 数组过滤器 https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/filter
let myObj = {
foo0: 'test',
_foo1: 'test',
_foo2: 'test',
foo3: 'test',
};
let result = Object.keys(myObj).filter(v => v.startsWith("_"));
console.log(result);
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