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                合規國際互聯網加速 OSASE為企業客戶提供高速穩定SD-WAN國際加速解決方案。 廣告
                在相對于視圖開始處的指定字節偏移量位置處獲取 Float64 值。沒有對齊約束;可從任何偏移量獲取多字節值。 ## 語法 ~~~ var testFloat = dataView.getFloat64(byteOffset, littleEndian); ~~~ ## 參數 |參數|定義| |--|--| |testFloat|必需。從該方法返回的 Float64 值。| |byteOffset|緩沖區中將用于檢索該值的位置。| |littleEndian|可選。如果為 false 或未定義,則應讀取一個 big-endian 值,否則應讀取一個 little-endian 值。| ## 備注 如果這些方法在視圖末尾之外進行讀取,則將引發異常。 下面的示例演示如何在 DataView 中獲取第一個 Float64。 ~~~ var req = new XMLHttpRequest(); req.open('GET', "http://www.example.com"); req.responseType = "arraybuffer"; req.send(); req.onreadystatechange = function () { if (req.readyState === 4) { var buffer = req.response; var dataView = new DataView(buffer); alert(dataView.getFloat64(0)); } } ~~~
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