7.12work/String.html at master · lisiming228/7.12work · GitHub

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<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <script>
        var str='   Hello world   ';
        console.log(str.length);
        console.log(str.charAt(3));
        console.log(str.charCodeAt(2));
        console.log(str.indexOf('o'));
        console.log(String.fromCharCode(97));
        console.log(str.lastIndexOf('o'));
        console.log(str.replace("l","c"));
        console.log(str.slice(2,6));
        console.log(str.slice(2,5));
        console.log(str.substring(2,7));
        console.log(str.substr(2,3));
        console.log(str.split("e"));
        console.log(str.toLowerCase());
        console.log(str.toUpperCase());
        console.log(str.trim());
        console.log(str.match(/o/g));
        console.log(str.concat('a','b','c'));
        console.log('abc'.padStart(7));
        console.log('abc'.padEnd(1));
    </script>
</head>
<body>

</body>
</html>