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buildRegex.html
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buildRegex.html
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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Title</title>
</head>
<body>
<script>
var defaultTagRE = /\{\{((?:.|\n)+?)\}\}/g; //匹配viwe 视图中的{{指令}}
var regexEscapeRE = /[-.*+?^${}()|[\]\/\\]/g; //匹配特殊符号 - 或者. 或者* 或者+ 或者? 或者^ 或者$ 或者{ 或者} 或者( 或者) 或者| 或者[ 或者] 或者/ 或者\
/*
* var aFn = cached(function(string){
*
* return string
* })
* aFn(string1);
* aFn(string2);
* aFn(string);
* aFn(string1);
* aFn(string2);
*
* aFn 函数会多次调用 里面就能体现了
* 用对象去缓存记录函数
* */
function cached(fn) {
var cache = Object.create(null);
return (function cachedFn(str) {
var hit = cache[str];
return hit || (cache[str] = fn(str))
})
}
var buildRegex = cached(function (delimiters) {
var open = delimiters[0].replace(regexEscapeRE, '\\$&'); //$& 与 regexp 相匹配的子串。 这里的意思是遇到了特殊符号的时候在正则里面需要替换加多一个/斜杠
var close = delimiters[1].replace(regexEscapeRE, '\\$&');
return new RegExp(open + '((?:.|\\n)+?)' + close, 'g') // 匹配开始的open +任意字符或者换行符+ close 全局匹配
});
// console.log(buildRegex(['${','}']))
// console.log( 'abcdef${name},asdfsadf${age}'.match(buildRegex(['${','}'])));
var data={
name:'yao',
age:28,
}
let str = '姓名${name},年龄${age}'.replace(/\$\{((?:.|\\n)+?\})/g,function (val) {
let reg = "(?<=\\{)[^\\}]+"; //匹配括号中的内容
return data[val.match(reg)[0]]
})
console.log(str)
</script>
</body>
</html>