使用javascript仅显示银行帐户中的最后4位数字 [英] show only last 4 digits in bank account using javascript

问题描述

我需要有关Javascript的帮助。我需要替换包含银行帐号的文本字段的最后4位之前的许多字符。我在网上搜索了这个，但找不到一个有效的代码。我确实在stackoverflow上找到了一个关于信用卡的代码，

I need help with Javascript. I need to replace however many characters there are previous to the last 4 digits of a text field that contains bank account number. I have searched through the net on this, but cannot find one code that works. I did find a code here on stackoverflow, which was regarding credit card,

new String('x', creditCard.Length - 4) + creditCard.Substring(creditCard.Length - 4);

我刚用accounNumObject替换了creditCard：

I just replaced the creditCard with accounNumObject:

var accounNumObject = document.getElementById("bankAcctNum")

输入非常简单。

<cfinput type="text" name="bankAcctNum" id="bankAcctNum" maxlength="25" size="25" value="#value#" onblur="hideAccountNum();">

有人可以帮忙吗？

推荐答案

要用 x 替换字符串，除了JavaScript中的最后四个字符，你可以使用（假设 str 持有字符串）...

To replace a string with x except for the last four characters in JavaScript, you could use (assuming str holds the string)...

var trailingCharsIntactCount = 4;

str = new Array(str.length - trailingCharsIntactCount + 1).join('x')
       + str.slice(-trailingCharsIntactCount);

jsFiddle 。

你也可以使用正则表达式......

You could also use a regular expression...

str = str.replace(/.(?=.{4})/g, 'x');

如果你想添加 4 来自变量，使用 RegExp 构造函数构造正则表达式。

If you want to add the 4 from a variable, construct the regex with the RegExp constructor.

jsFiddle 。

如果你有幸获得支持，也......

If you're fortunate enough to have the support, also...

const trailingCharsIntactCount = 4;

str = 'x'.repeat(str.length - trailingCharsIntactCount)
        + str.slice(-trailingCharsIntactCount);

的Polyfill> String.prototype.repeat（） 可用。

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