JavaScript DataView.getUint16()用法及代碼示例

JavaScript DataView.getUint16() 是 dataView 中的一個內置方法。它用於獲取指定位置的無符號 16 位整數(無符號短整型)數。

用法

dataview.getUint16(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

此方法返回一個無符號的 16 位整數。

瀏覽器支持

Chrome	9
Safari	5.1
Firefox	15
Opera	12.1

例子1

<script>
//JavaScript to illustrate dataview.getUint16() method
// creating a ArrayBuffer 
var JavaTpoint = new ArrayBuffer(8);
// creating a view
var arr = new DataView(JavaTpoint);
// put the value 3.1 at slot 1
arr.setUint16(1,3.1);
document.write("Convert the value 3.1 to:<br><br>");
document.write(arr.getUint16(1));
//expected output:3
</script>

輸出：

Convert the value 3.1 to:

3

例子2

<script>
//JavaScript to illustrate dataview.getUint16() method
// if there is no data to be stored then it returns Nan
// creating a ArrayBuffer 
var JavaTpoint = new ArrayBuffer(8);
// creating a view
var arr = new DataView(JavaTpoint);
// NO Data
arr.setUint16(1);
document.write("If there is no data to be stored, then Output will Be:<br><br>")
document.write(arr.getUint16(1));
//expected output:0
</script>

輸出：

If there is no data to be stored, then Output will Be:

0

例子3

<script>
//JavaScript to illustrate dataview.getUint16() method
// creating a ArrayBuffer 
var JavaTpoint = new ArrayBuffer(8);
// creating a view
var arr = new DataView(JavaTpoint);
//We can also use math function like Math.PI
arr.setUint16(1,Math.PI);
document.write("convert the PI value 3.14 to:<br><br>");
document.write(arr.getUint16(1));
//expected output:3
</script>

輸出：

convert the PI value 3.14 to:

3

示例 4

<script>
//JavaScript to illustrate dataview.getUint16() method
// creating a ArrayBuffer 
var JavaTpoint = new ArrayBuffer(8);
// creating a view
var arr = new DataView(JavaTpoint);
// put the value 40 at slot 1
arr.setUint16(1,40);
document.write("If we give an Integer value then Output will Integer be<br><br>");
document.write(arr.getUint16(1));
//expected output:40
</script>

輸出：

If we give an Integer value then Output will Integer be

40

相關用法

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