js小数的验证

/**  * str 传入字符串  *  len 字符串长度  *  i 小数点限定位数**/function check(str,len,i){if(str.length>len){alert("超长");return false;}var s = '^\\d+(\\.\\d{1,'+i+'})?$';var re = new RegExp(s);alert(re.test(str));if(!re.test(str)){return false;}else{return true;}}