HTML5 TypeArray和Unicode 字符之间转换

最新推荐文章于 2022-01-05 12:29:49 发布

转载最新推荐文章于 2022-01-05 12:29:49 发布 · 135 阅读

本文介绍了如何使用JavaScript将字符串转换为ArrayBuffer对象，并反向转换回字符串。通过Uint32Array、Uint16Array和Uint8Array进行了实验，发现Uint16Array能够成功实现双向转换。

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1.Uint32Array测试成功

    // Uint32Array 测试成功
    //字符串转为ArrayBuffer对象
    function strToab() {
        var str = '张三丰';
        var buf = new ArrayBuffer(str.length * 4);
        var bufView = new Uint32Array(buf);
        for (var i = 0; i < str.length; i++) {
            bufView[i] = str.charCodeAt(i);
        }
        console.info(bufView);
    }
    strToab();
    //将 ArrayBuffer对象，转换成字符串
    function abTostr() {
        var bufView = new Uint32Array([24352, 19977, 20016]); //[24352, 19977, 20016]
        console.info(bufView);
        var result = '';
        for (var i = 0; i < bufView.length; i++) {
            result += String.fromCharCode(bufView[i]);
        }
        console.info(result); //输出结果为空
    }
    abTostr();

2.Uint16Array测试成功

    //Uint16Array 测试成功
    //字符串转为ArrayBuffer对象
    function strToab() {
        var str = '张三丰';
        var buf = new ArrayBuffer(str.length * 2);
        var bufView = new Uint16Array(buf);
        for (var i = 0; i < str.length; i++) {
            bufView[i] = str.charCodeAt(i);
        }
        console.info(bufView);
    }
    strToab();
    //将 ArrayBuffer对象，转换成字符串
    function abTostr() {
        //方式1，无效
        //var buf = new ArrayBuffer([24352, 19977, 20016]);
        //var bufView = new Uint16Array(buf); //获得的结果为空
        //方式2，有效
        var bufView = new Uint16Array([24352, 19977, 20016]); //[24352, 19977, 20016]
        var result = '';
        for (var i = 0; i < bufView.length; i++) {
            result += String.fromCharCode(bufView[i]);
        }
        console.info(result); //输出结果 '张三丰'
    }
    abTostr();

3.Uint8Array 测试失败

        //Uint8Array 测试失败
    //字符串转为ArrayBuffer对象
    function strToab() {
        var str = '张三丰';
        var buf = new ArrayBuffer(str.length * 2);
        var bufView = new Uint8Array(buf);
        for (var i = 0; i < str.length; i++) {
            bufView[i] = str.charCodeAt(i);
        }
        console.info(bufView);
    }
    strToab();
    //将 ArrayBuffer对象，转换成字符串
    function abTostr() {
        var buf = new ArrayBuffer([24352, 19977, 20016]);
        // var bufView = new Uint16Array(buf); //获得的结果为空
        var bufView = new Uint8Array([32, 9, 48]); //[24352, 19977, 20016]
        console.info(bufView);
        var result = '';
        for (var i = 0; i < bufView.length; i++) {
            result += String.fromCharCode(bufView[i]);
        }
        console.info(result); //输出结果为空
    }
    abTostr();