普通字符串转换为 HEX（十六进制）字符串

1、使用 Buffer

用于 Node.js 环境

const str = "test123";

const hexStr = Buffer.from(str, "utf8").toString("hex");

console.log(hexStr);

# 输出结果

74657374313233

2、使用 charCodeAt

用于浏览器环境与 Node.js 环境

const str = "test123";

let hexStr = "";

for (let i = 0; i < str.length; i++) {
    const charCode = str.charCodeAt(i);
    hexStr += charCode.toString(16).padStart(2, "0");
}

console.log(hexStr);

# 输出结果

74657374313233

3、使用 TextEncoder + Array.from

用于浏览器环境与 Node.js 环境

const str = "test123";

const encoder = new TextEncoder();
const bytes = encoder.encode(str);

const hexStr = Array.from(bytes, (byte) => byte.toString(16).padStart(2, "0")).join("");

console.log(hexStr);

# 输出结果

74657374313233

封装成函数

1、使用 Buffer

function strToHexStr(str) {
    const hexStr = Buffer.from(str, "utf8").toString("hex");
    return hexStr;
}

const str = "test123";

const hexStr = strToHexStr(str);

console.log(hexStr);

# 输出结果

74657374313233

2、使用 charCodeAt

function strToHexStr(str) {
    let hexStr = "";
    for (let i = 0; i < str.length; i++) {
        const charCode = str.charCodeAt(i);
        hexStr += charCode.toString(16).padStart(2, "0");
    }
    return hexStr;
}

const str = "test123";

const hexStr = strToHexStr(str);

console.log(hexStr);

# 输出结果

74657374313233

3、使用 TextEncoder + Array.from

function strToHexStr(str) {
    const encoder = new TextEncoder();
    const bytes = encoder.encode(str);
    const hexStr = Array.from(bytes, (byte) => byte.toString(16).padStart(2, "0")).join("");
    return hexStr;
}

const str = "test123";

const hexStr = strToHexStr(str);

console.log(hexStr);

# 输出结果

74657374313233