记正则表达式匹配首尾为特定字符的字符串，以及replace第二个参数的用法

1&＃xff0c;正则表达式&＃xff0c;匹配开头为&＃39;&＃64;&＃64;[&＃39;&＃xff0c;以‘]##&＃39;’结尾的字符串&＃xff0c;正则表达式如下

  let regExp&＃61;/\&＃64;\&＃64;\[.*?\]\#\#/g; 

2&＃xff0c;匹配正则&＃xff0c;并动态替换

window.sessionStorage.setItem(userId, &＃39;zhangsan&＃39;); //存储userIdlet param &＃61; {name: &＃39;&＃64;&＃64;[userId]##&＃39;
}for(var key in param){var str &＃61; param[key]; //json对的值var newStr &＃61; str.replace(regExp, function ($0){console.log(&＃39;匹配值&＃39;,$0)var str &＃61; $0.substring(3, $0.length-3); //去掉首尾特殊字符var value &＃61; window.sessionStorage.getItem(str); //从本地存储中获取变量return value;} );console.log(newStr)newParam[key] &＃61; newStr;}
console.log(newParam)

3&＃xff0c;输出为

{name: zhangsan
}