话不多说，请看具体实现代码

//从字符串'Is this all there is'中剪去'is': var str='Is this all there is'; var subStr=new RegExp('is');//创建正则表达式对象 var result=str.replace(subStr,"");//把'is'替换为空字符串 console.log(result);//Is th all there is var subStr=new RegExp('is','i');//创建正则表达式对象,不区分大小写 var result=str.replace(subStr,"");//把'is'替换为空字符串 console.log(result);//this all there is var subStr=new RegExp('is','ig');//创建正则表达式对象,不区分大小写,全局查找 var result=str.replace(subStr,"");//把'is'替换为空字符串 console.log(result);//th all there var subStr=/is/ig;//直接量法创建正则表达式对象,不区分大小写,全局查找 var result=str.replace(subStr,"");//把'is'替换为空字符串 console.log(result);//th all there console.log(str);//Is this all there is 可见replace并不改变原始str

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