Unescapes escaped HTML characters.
- Use
String.prototype.replace()
with a regexp that matches the characters that need to be unescaped. - Use the function’s callback to replace each escaped character instance with its associated unescaped character using a dictionary (object).
代码实现
const unescapeHTML = str =>
str.replace(
/&|<|>|'|"/g,
tag =>
({
'&': '&',
'<': '<',
'>': '>',
''': "'",
'"': '"'
}[tag] || tag)
);
unescapeHTML('<a href="#">Me & you</a>');
// '<a href="#">Me & you</a>'