字符串脱敏

// 处理脱敏的函数,str指的是要处理的字符串，beginLen：从第几位开始，endLen：倒数几位结束（负数）

desensitization(str, beginLen, endLen){

let len = str.length;

let firstStr = str.substr(0, beginLen);

let lastStr = str.substr(endLen);

let middleStr = str.substring(beginLen, len-Math.abs(endLen)).replace(/[sS]/ig, '*');

let tempStr = firstStr+middleStr+lastStr;

return tempStr;

},

 

例子：desensitization(str, 4, -3)//从第四位开始到倒数第三位脱敏