typescript 屏蔽字符串
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Masking a string
提问by Pedro Pam
I need to put a received string in this format="## ## ## ###" in typescript/javascript. ( like "12 34 56 789).
我需要在 typescript/javascript 中以这种格式放置一个接收到的字符串 =“## ## ## ###”。（如“12 34 56 789）。
I know there's "string-mask" and some way via JQuery, is there a simplier way to do it?
我知道有“字符串掩码”和通过 JQuery 的某种方式，有没有更简单的方法来做到这一点？
回答by Nina Scholz
You could replace each pattern part with the wanted data.
您可以用所需的数据替换每个模式部分。
function format(value, pattern) {
var i = 0,
v = value.toString();
return pattern.replace(/#/g, _ => v[i++]);
}
console.log(format(123456789, '## ## ## ###'));回答by Paul Milham
I needed one that masks any character with a "*", from the beginning or end of the string, so I wrote the following:
我需要一个用“*”掩盖字符串开头或结尾的任何字符，所以我写了以下内容：
"use strict";
module.exports = {
/**
* @param {string} str
* @param {string} maskChar
* @param {number} unmaskedLength
* @param {boolean} [maskFromStart]
* @returns {string}
*/
mask(str, maskChar, unmaskedLength, maskFromStart = true) {
const maskStart = maskFromStart ? 0 : Math.max(0, unmaskedLength);
const maskEnd = maskFromStart ? Math.max(0, str.length - unmaskedLength) : str.length;
return str
.split("")
.map((char, index) => {
if (index >= maskStart && index < maskEnd) {
return maskChar;
}
else {
return char;
}
})
.join("");
},
};
