var str = "matrix(1, 0, 0, 1, -500, 0)"; var reg = /([^,]+),[^,]+\)$/g; console.time("111"); console.log(reg.exec(str)[1]); console.timeEnd("111"); /** * n=0 获取函数名 * n>0 获取函数参数 */ function findParam(str,n){ var len = str.length; var count = 0; var ret = ''; for(var i=0;i<len;i++){ if(str[i]==','||str[i]==')'||str[i]=='('){ if(++count==n+1) return ret; }else if(count==n){ ret += str[i]; } } return ret; } console.time("222"); console.log(findParam(str,5)); console.timeEnd("222");