JS替换不在字符串上工作 [英] JS replace not working on string
问题描述
尝试用变量替换字符串中#的所有实例。它没有工作,但也没有重新调整任何错误。
Trying to replace all instances of # in a string with a variable. It's not working but not retuning any error either.
answer_form = '<textarea name="answer_#" rows="5"></textarea>'+
'<input type="file" name="img_#" />';
question_num = 5;
answer_form.replace(/#/g, question_num);
哈希值仍然存在。
不确定我缺少什么?
推荐答案
.replace()
返回一个新字符串(它不会修改现有字符串)所以你需要:
.replace()
returns a new string (it does not modify the existing string) so you would need:
answer_form = answer_form.replace(/#/g, question_num);
您可能还应该 question_num
一个字符串虽然自动类型转换可能会为您处理。
You probably should also make question_num
a string though auto type conversions probably handle that for you.
工作示例: http://jsfiddle.net/jfriend00/4cAz5/
仅供参考,在Javascript中,字符串是不可变的 - 永远不会修改现有字符串。所以任何修改字符串的方法(如 concat
,替换
, slice
, substr
, substring
, toLowerCase
, toUpperCase
等等......)总是返回一个新字符串。
FYI, in Javascript, strings are immutable - an existing string is never modified. So any method which makes a modification to the string (like concat
, replace
, slice
, substr
, substring
, toLowerCase
, toUpperCase
, etc...) ALWAYS returns a new string.
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