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indexOf.html
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48 lines (36 loc) · 955 Bytes
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<!doctype html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="Generator" content="EditPlus®">
<meta name="Author" content="">
<meta name="Keywords" content="">
<meta name="Description" content="indexOf()方法返回给定元素能找在数组中找到的第一个索引值，否则返回-1。">
<meta name="link" content="https://developer.mozilla.org/zh-CN/docs/Web/JavaScript/Reference/Global_Objects/Array/indexOf" />
<title>indexOf</title>
</head>
<body>
<h1>Array</h1>
<code>
// array
<br />
var array = [2, 4, 6, 8, 10];
<br />
array.indexOf(2); //0
</code>
<h1>String</h1>
<code>
var string = "Hello World!"
<br />
console.log(string.indexOf('l')); //2
</code>
<script type="text/javascript">
// array
var array = [2, 4, 6, 8, 10];
array.indexOf(2); //0
//String
var string = "Hello World!"
console.log(string.indexOf('l')); //2
</script>
</body>
</html>