話不多說，請看具體實現代碼
//從字符串'Is this all there is'中剪去'is':
var str='Is this all there is';
var subStr=new RegExp('is');//創建正則表達式對象
var result=str.replace(subStr,"");//把'is'替換為空字符串
console.log(result);//Is th all there is
var subStr=new RegExp('is','i');//創建正則表達式對象,不區分大小寫
var result=str.replace(subStr,"");//把'is'替換為空字符串
console.log(result);//this all there is
var subStr=new RegExp('is','ig');//創建正則表達式對象,不區分大小寫,全局查找
var result=str.replace(subStr,"");//把'is'替換為空字符串
console.log(result);//th all there
var subStr=/is/ig;//直接量法創建正則表達式對象,不區分大小寫,全局查找
var result=str.replace(subStr,"");//把'is'替換為空字符串
console.log(result);//th all there
console.log(str);//Is this all there is 可見replace並不改變原始str
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