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>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!
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