How to convert numbers to strings in JS-JS Tutorial-php.cn

How to convert numbers to strings in JS

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Release： 2018-04-18 17:11:54

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This time I will show you how to convert numbers and strings in JS, and how to convert numbers and strings in JSNotesare Which ones, the following are practical cases, let’s take a look.

<!DOCTYPE html>
<html>
<head>
  <title></title>
</head>
<body>
  <script type="text/javascript">
    var print = new Function("x", "document.write(x)");
    var println = new Function("x", "document.write(x + '<br>')");
    var n = 1.23456;
    var str = "123.456";
    println("number to String...");
    /* 加上一个空字符串 */
    println(typeof(n + ""));
    /* 使用 String 函数 */
    println(typeof(String(n)));
    /* 使用 toString() 方法 ，可以提供一个可选的参数，指定转换的基数(2 - 36)，默认基数是10 */
    println(typeof n.toString(16));
    println("0x" + n.toString(16)); // 0x1.3c0c1fc8f3238
    /* 把一个数字转换为字符串，并指定小数位数 */
    println(n.toFixed(2));     // 1.23
    /* 指数表示，参数指定小数位数 */
    println(n.toExponential(1));  // 1.2e+0
    /* 参数指定有效数字的个数 */
    println(n.toPrecision(7));   // 1.234560
    println("");
    println("string to number...");
    /* 减去一个数字 0 */
    println(typeof (str - 0));
    /* 使用 Number 函数 */
    println(typeof(Number(str)));
    /* 只转换整数， 忽略舍去非数字部分，可以提供一个参数指定转换的基数(2 ~ 36)*/
    println(parseInt(" 4 line 5 row"));  // 4
    println(parseInt("row 4"));       // NaN
    println(parseInt("1111", 2));      // 15
    println(parseInt("ff", 16));      // 255
    println(parseInt("zz", 36));      // 1295
    /* 转换为浮点数 */
    println(parseFloat("1.23e-2 like"));  // 0.0123
    println(parseFloat("125"));       // 125
  </script>
</body>
</html>

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I believe you have mastered the method after reading the case in this article. For more exciting information, please pay attention to other related articles on the php Chinese website!