httpsss://js.do/powenko/02-string

<script>
var str1="統一編號_list";
console.log(str1.replace('_list', ''));

var p = 'the lazy dog. lovely dog.';
var regex = /dog/gi;
console.log(p.replace(regex, 'monkey')); //全部替換　　dog 到　　monkey
// 輸出：　the lazy monkey. lovely monkey.
console.log(p.replace('dog', 'monkey')); //替換第一個 　dog 到　　monkey
// 輸出：　the lazy monkey. lovely dog.
</script>