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docs(ArrayBuffer): optimize ab2str()

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waiting 2017-10-14 16:01:38 +08:00
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commit 143a1e4b13
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1 changed files with 11 additions and 1 deletions
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docs/arraybuffer.md
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@ -452,7 +452,17 @@ Float64Array.BYTES_PER_ELEMENT // 8
```javascript ```javascript
// ArrayBuffer转为字符串，参数为ArrayBuffer对象 // ArrayBuffer转为字符串，参数为ArrayBuffer对象
function ab2str(buf) { function ab2str(buf) {
return String.fromCharCode.apply(null, new Uint16Array(buf)); if (buf && buf.byteLength < 128000) { // limit max length avoid overhead
return String.fromCharCode.apply(null, new Uint16Array(buf));
}
const len = bufView.byteLength;
const bstr = new Array(len);
const bufView = new Uint16Array(buf);
for (let i = 0; i < len; i++) {
bstr[i] = String.fromCharCode.call(null, bufView[i]);
}
return bstr.join('');
} }
// 字符串转为ArrayBuffer对象，参数为字符串 // 字符串转为ArrayBuffer对象，参数为字符串