JavaScript DataView.getFloat64() 是 dataView 中的一個內置方法。它用於在指定位置獲取有符號的 64 位浮點(double)數。
注意:64 位浮點數的範圍是從 -1.7+308 到 +1.7E+308。
用法
dataview.getFloat64(byteOffset)
參數
byteoffset: 從讀取數據的視圖開始的偏移量,以字節為單位。
返回值
一個有符號的 64 位浮點數。
瀏覽器支持
Chrome | 9 |
Safari | 5.1 |
Firefox | 15 |
Opera | 12.1 |
例子1
<script>
//JavaScript to illustrate dataview.getFloat64() method
// creating a ArrayBuffer
var JavaTpoint = new ArrayBuffer(20);
// Creating a view
var arr = new DataView(JavaTpoint);
// put the value 5.7 at slot 1
arr.setFloat64(1,5.7);
document.write("If we give a Float value then output will be<br><br>");
document.write(arr.getFloat64(1));
//expected output:5.7
</script>
輸出:
If we give a Float value then output will be 5.7
例子2
<script>
//JavaScript to illustrate dataview.getFloat64() method
// if there is no data to be stored then it returns Nan
// creating a ArrayBuffer
var JavaTpoint = new ArrayBuffer(10);
// creating a view
var arr = new DataView(JavaTpoint);
// NO Data
arr.setFloat64(1);
document.write(" if there is no data to be stored, then Output will Be:<br><br>")
document.write(arr.getFloat64(1));
//expected output:NAN
</script>
輸出:
if there is no data to be stored, then Output will Be: NaN
例子3
<script>
//JavaScript to illustrate dataview.getFloat64() method
// creating a ArrayBuffer
var JavaTpoint = new ArrayBuffer(10);
// creating a view
var arr = new DataView(JavaTpoint);
//We can also use math function like Math.PI
document.write("PI value will be<br><br>");
arr.setFloat64(1,Math.PI);
document.write(arr.getFloat64(1));
//expected output:3.141592653589793
</script>
輸出:
PI value will be 3.141592653589793
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注:本文由純淨天空篩選整理自 JavaScript DataView.getFloat64() method。非經特殊聲明,原始代碼版權歸原作者所有,本譯文未經允許或授權,請勿轉載或複製。