js控制全角半角

function isFullWidth(char) {
    const code = char.charCodeAt(0);
    return (code >= 0x3000 && code <= 0x303F) || // CJK symbols and punctuation
           (code >= 0xFF00 && code <= 0xFFEF) || // Halfwidth and Fullwidth Forms
           (code >= 0x4E00 && code <= 0x9FFF);   // CJK Unified Ideographs
}

function toHalfWidth(str) {
    return str.replace(/[\u3000-\u303F\uFF00-\uFFEF\u4E00-\u9FFF]/g, function(ch) {
        const code = ch.charCodeAt(0);
        if (code >= 0xFF00 && code <= 0xFFEF) {
            return String.fromCharCode(code - 0xFEE0);
        } else if (code === 0x3000) {
            return ' ';
        } else {
            // 对于其他全角字符，可以根据需要进行处理
            return ch;
        }
    });
}

function toFullWidth(str) {
    return str.replace(/[\u0020-\u007E]/g, function(ch) {
        const code = ch.charCodeAt(0);
        if (code >= 0x20 && code <= 0x7E) {
            return String.fromCharCode(code + 0xFEE0);
        } else {
            return ch;
        }
    }).replace(/ /g, '　'); // 半角空格转换为全角空格
}

const input = "Hello，世界！ １２３";
const halfWidth = toHalfWidth(input);
console.log(halfWidth); // "Hello,世界! 123"

const fullWidth = toFullWidth(input);
console.log(fullWidth); // "Hello，世界！１２３"