to_number用法示例
Number()函數 (Number() function)
Number() function is a predefined global function in JavaScript, it used to convert an object to the number. If the function is not able to convert the object in a number – it returns "NaN". (Read more: NaN in JavaScript).
Number()函數是JavaScript中預定義的全局函數，用于將對象轉換為數字。 如果函數無法將對象轉換為數字，則返回“ NaN” 。 (了解更多： JavaScript中的NaN )。
Note:
注意：
If we convert Boolean values to the number, Number() function returns 0 or 1.
如果將布爾值轉換為數字，則Number()函數將返回0或1。
If we convert a date object to the number, Number() function returns value in milliseconds.
如果我們將日期對象轉換為數字，則Number()函數將返回以毫秒為單位的值。
Example:
例：
<html>
<head>
<title>JavaScipt Example</title>
</head>
<body>
<script>
var a = "10";
var b = "10 20";
var c = "1234 Hello";
var d = "Hello 1234";
var e = true;
var f = new Date();
//converting values to number using Number() function
document.write("Number(a) = " + Number(a) + "<br>");
document.write("Number(b) = " + Number(b) + "<br>");
document.write("Number(c) = " + Number(c) + "<br>");
document.write("Number(d) = " + Number(d) + "<br>");
document.write("Number(e) = " + Number(e) + "<br>");
document.write("Number(f) = " + Number(f) + "<br>");
</script>
</body>
</html>
Output
輸出量
Number(a) = 10
Number(b) = NaN
Number(c) = NaN
Number(d) = NaN
Number(e) = 1
Number(f) = 1549128507537
翻譯自: https://www.includehelp.com/code-snippets/Number-function-with-example-in-javascript.aspx
to_number用法示例
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