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字符串函数的运用

news 2026/5/12 15:53:22

<!DOCTYPE html>
<html lang="zh - CN"><head><meta charset="UTF - 8"><meta name="viewport" content="width=device-width, initial - scale=1.0"><title>字符串函数示例</title>
</head><body><script>// charAt() 示例
        let str1 = "Hello";console.log("charAt() 示例：" + str1.charAt(1));// charCodeAt() 示例
        let str2 = "World";console.log("charCodeAt() 示例：" + str2.charCodeAt(0));// concat() 示例
        let str3 = "Hello";let str4 = " World";console.log("concat() 示例：" + str3.concat(str4));// fromCharCode() 示例
        console.log("fromCharCode() 示例：" + String.fromCharCode(65, 66, 67));// indexOf() 示例
        let str5 = "abcabc";console.log("indexOf() 示例：" + str5.indexOf('b'));// lastIndexOf() 示例
        console.log("lastIndexOf() 示例：" + str5.lastIndexOf('b'));// localeCompare() 示例
        let str6 = "apple";let str7 = "banana";console.log("localeCompare() 示例：" + str6.localeCompare(str7));// match() 示例
        let str8 = "I love JavaScript";console.log("match() 示例：" + str8.match(/love/));// replace() 示例
        let str9 = "The cat is cute";console.log("replace() 示例：" + str9.replace("cat", "dog"));// search() 示例
        let str10 = "Find the keyword";console.log("search() 示例：" + str10.search(/keyword/));// slice() 示例
        let str11 = "JavaScript is fun";console.log("slice() 示例：" + str11.slice(0, 10));// split() 示例
        let str12 = "apple,banana,cherry";console.log("split() 示例：" + str12.split(','));// substr() 示例
        let str13 = "Substring example";console.log("substr() 示例：" + str13.substr(0, 5));// substring() 示例
        let str14 = "Another substring example";console.log("substring() 示例：" + str14.substring(0, 5));// toLocaleLowerCase() 示例
        let str15 = "HELLO";console.log("toLocaleLowerCase() 示例：" + str15.toLocaleLowerCase());// toLocaleUpperCase() 示例
        let str16 = "hello";console.log("toLocaleUpperCase() 示例：" + str16.toLocaleUpperCase());// toLowerCase() 示例
        let str17 = "UpperCase";console.log("toLowerCase() 示例：" + str17.toLowerCase());// toString() 示例
        let num = 123;console.log("toString() 示例：" + num.toString());// toUpperCase() 示例
        let str18 = "lowercase";console.log("toUpperCase() 示例：" + str18.toUpperCase());// trim() 示例
        let str19 = "   Trim me   ";console.log("trim() 示例：" + str19.trim());// valueOf() 示例
        let strObj = new String("ValueOf example");console.log("valueOf() 示例：" + strObj.valueOf());</script>
</body></html>