当我跑
'{{123}}'.split(/(\{\{)|(\}\})/g, -1)
我预计
["", "123", ""]
但它显示
["", "{{", undefined, "123", undefined, "}}", ""]
为什么？？有什么不对的吗？
问问题
122 次
2 回答
2
采用：
'{{123}}'.split(/\{\{|\}\}/)
使用时不需要抓组.split
于 2012-09-16T12:58:26.147 回答
1
http://es5.github.com/#x15.5.4.14
如果 separator 是一个包含捕获括号的正则表达式，那么每次 separator 匹配时，捕获括号的结果（包括任何未定义的结果）都会拼接到输出数组中。例如，
"A<B>bold</B>and<CODE>coded</CODE>".split(/<(\/)?([^<>]+)>/)
评估为数组
["A", undefined, "B", "bold", "/", "B", "and", undefined, "CODE", "coded", "/", "CODE", ""]
所以，'{{123}}'.split(/(\{\{)|(\}\})/g, -1)返回
["",
"{{", undefined, // "{{" is matched, but "}}" isn't.
"123",
undefined, "}}", // "{{" isn't matched, but "}}" is matched.
""]
于 2012-09-16T13:14:47.100 回答