HarmonyOS 如何将字符串转换为UTF-8编码的字节数组

可以参考以下代码：

let that = new util.TextEncoder();
let buffer = new ArrayBuffer(4);
let dest = new Uint8Array(buffer);
let result = new Object();
result = that.encodeIntoUint8Array('abcd', dest);
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TextEncoder参考链接：https://developer.huawei.com/consumer/cn/doc/harmonyos-references-V5/js-apis-util-V5#textencoder