/*
* 参数说明：
* number：要格式化的数字
* decimals：保留几位小数
* roundtag:舍入参数，默认 ‘ceil‘ 向上取,‘floor‘向下取,‘round‘ 四舍五入
* */
function numberFormat(obj, decimals) {
    var number = obj.value;
    number = (number + "").replace(/[^0-9+-Ee.]/g, "");
    number = number.replace(/,/g, ""); 
    var roundtag = "round";  // 四舍五入
    var n = !isFinite(+number) ? 0 : +number;
    var prec = !isFinite(+decimals) ? 0 : Math.abs(decimals);
    var sep = ","; //千分位符号
    var dec = "."; //小数点符号
    var s = "";
    var toFixedFix = function (n, prec) {
        var k = Math.pow(10, prec);
        console.log();

        return "" + parseFloat(Math[roundtag](parseFloat((n * k).toFixed(prec * 2))).toFixed(prec * 2)) / k
    }
    s = (prec ? toFixedFix(n, prec) : "" + Math.round(n)).split(".");
    var re = /(-?\d+)(\d{3})/;
    while (re.test(s[0])) {
        s[0] = s[0].replace(re, "$1" + sep + "$2");
    }

    if ((s[1] || "").length < prec) {
        s[1] = s[1] || "";
        s[1] += new Array(prec - s[1].length + 1).join("0");
    }

    obj.value = s.join(dec);//给原input框重新赋值
}


function endWith(str, s) {
    if (s == null || s == "" || str.length == 0 || s.length > str.length)
        return false;
    if (str.substring(str.length - s.length) == s)
        return true;
    else
        return false;
}

function startWith(str, s) {
    if (s == null || s == "" || str.length == 0 || s.length > str.length)
        return false;
    if (str.substr(0, s.length) == s)
        return true;
    else
        return false;

}

function replaceAll(s1, s2, s3) {
    return s1.replace(new RegExp(s2, 'gm'), s3);
}

/**
 * AtPara=@key1=value1@key2=valu2...@keyN=valueN
 */
function GetAtPara(atPara, key) {
	if (typeof atPara != "string" || typeof key == "undefined" || key == "") {
		return undefined;
	}
	var reg = new RegExp("(^|@)" + key + "=([^@]*)(@|$)");
	var results = atPara.match(reg);
	if (results != null) {
		return unescape(results[2]);
	}
	return undefined;
}

/**
 * 输入验证firfox, ff浏览器不支持execCommand()
 */
function isFF() {
	return navigator.userAgent.indexOf("Firefox") > 0;
}
function valitationBefore(o, validateType) {
	if (isFF()) {
		var value = o.value;
		var flag = false;
		switch (validateType) {
			case "int" :
				flag = (!isNaN(value) && value % 1 === 0);
			break;
			case "float" :
			case "money":
                if (value.indexOf("-")===0 && value.length===1)
                    break;
                flag = !isNaN(value);
                break;
		}
        if (flag)
            return;
	}
}

var idx = 0;
var oldCount = 0;
function valitationAfter(o, validateType) {
    idx = getCursortPosition(o);
    oldCount = getStrCount(o.value.toString().substr(0, idx), ',');
    var value = o.value;

    if (isFF()) {
        var flag = false;
        switch (validateType) {
            case "int":
                flag = (!isNaN(value) && value % 1 === 0);
                break;
            case "float":
            case "money":
                if (value.indexOf("-") == 0 && value.length == 1)
                    break;
                else {
                    flag = !isNaN(value);
                    break;
                }
        }
        if (!flag) {
            o.value = '';
        }
    } 
}



function addplaceholder(obj, bit) {
	if (obj.value == "") {

		switch (bit) {
			case 0:
				obj.value = '0';
				break;
			default:
				obj.value = '0.00';
		}

	}

}

/**
 * 输入验证firfox, ff浏览器不支持execCommand()
 */

function limitLength(obj, length) {
   obj.value = obj.value.replace(/[^\d,.-]/g, "");  //清除“数字”和“.”以外的字符 ;
    if (length != null && length != "" && length != "undefined") {
        if (obj.value.indexOf('.')>=0 && obj.value.split('.')[1].length > length) {
            obj.value = obj.value.substring(0, obj.value.length - 1);
            //obj.focus();
        }
    }
}

//类型为Money时输入设置
  function clearNoNum(obj){  
        //修复第一个字符是小数点 的情况.  
        if(obj.value !=''&& obj.value.substr(0,1) == '.'){  
            obj.value=0+obj.value;
        }
        if (obj.value == "")
            obj.value = 0.00;

        if (!/\./.test(obj.value)) //为整数字符串在末尾添加.00  
            obj.value += '.00';  

        obj.value = obj.value.replace(/^0*(0\.|[1-9])/, '$1');//解决 粘贴不生效  
        obj.value = obj.value.replace(/[^\d.]/g,"");  //清除“数字”和“.”以外的字符  
        obj.value = obj.value.replace(/\.{2,}/g,"."); //只保留第一个. 清除多余的       
        obj.value = obj.value.replace(".","$#$").replace(/\./g,"").replace("$#$",".");      
        obj.value = obj.value.replace(/^(-)*(\d+)\.(\d\d).*$/,'$1$2.$3');//只能输入两个小数       
        if(obj.value.indexOf(".")< 0 && obj.value !=""){//以上已经过滤，此处控制的是如果没有小数点，首位不能为类似于 01、02的金额  
            if(obj.value.substr(0,1) == '0' && obj.value.length == 2){  
                obj.value= obj.value.substr(1,obj.value.length);      
            }  
        }
    }

    //设置光标位置
    function setCaretPosition(ctrl, pos) {
        if (ctrl.setSelectionRange) {
            ctrl.focus();
            ctrl.setSelectionRange(pos, pos);
        }
        else if (ctrl.createTextRange) {
            var range = ctrl.createTextRange();
            range.collapse(false);
            range.moveEnd('character', pos);
            range.moveStart('character', pos);
            range.select();
        }
    }

    // 获取光标位置
    function getCursortPosition(ctrl) {
        var CaretPos = 0;   // IE Support
        if (document.selection) {
            ctrl.focus();
            var Sel = document.selection.createRange();
            Sel.moveStart('character', -ctrl.value.length);
            CaretPos = Sel.text.length;
        }
        // Firefox support
        else if (ctrl.selectionStart || ctrl.selectionStart == '0')
            CaretPos = ctrl.selectionStart;
        return (CaretPos);
    }

    function FormatMoney(obj, precision, separator) {
        //获取之前的，
        var oldV = obj.value;
        
        if (precision == undefined || precision == null || precision == "")
            precision = 2;
        if (precision != 2)
            return;
        oldV = oldV.replace(/[^\d.-]/g, "");
        var val = formatNumber(oldV, precision, separator);
        if (isNaN(val)==false )
            obj.value = val;
        var didx = getStrCount(val.toString().substr(0, idx),',');
        if (didx > oldCount && didx > 0)
            idx = idx +1;
        setCaretPosition(obj,idx);


    }

    //统计字符串中特定字符串的个数
function getStrCount(scrstr,armstr){ 
    //scrstr 源字符串 armstr 特殊字符
    var count=0;
    while(scrstr.indexOf(armstr) >=1 )
    {
        scrstr = scrstr.replace(armstr,"");
        count++;
    }

    return count;
}
    /** 
    * 将数值格式化成金额形式 
    * 
    * @param num 数值(Number或者String) 
    * @param precision 精度，默认不变
    * @param separator 分隔符，默认为逗号
    * @return 金额格式的字符串,如'1,234,567'，默认返回NaN
    * @type String 
    */
    function formatNumber(num, precision, separator) {
        if (precision != 2)
            return num;
        var parts;
        // 判断是否为数字
        if (!isNaN(parseFloat(num)) && isFinite(num)) {
            // 把类似 .5, 5. 之类的数据转化成0.5, 5, 为数据精度处理做准, 至于为什么
            // 不在判断中直接写 if (!isNaN(num = parseFloat(num)) && isFinite(num))
            // 是因为parseFloat有一个奇怪的精度问题, 比如 parseFloat(12312312.1234567119)
            // 的值变成了 12312312.123456713
            num = Number(num);
            // 处理小数点位数
            num = (typeof precision !== 'undefined' ? (Math.round(num * Math.pow(10, precision)) / Math.pow(10, precision)).toFixed(precision) : num).toString();
            // 分离数字的小数部分和整数部分
            parts = num.split('.');
            // 整数部分加[separator]分隔, 借用一个著名的正则表达式
            parts[0] = parts[0].toString().replace(/(\d)(?=(\d{3})+(?!\d))/g, '$1' + (separator || ','));

            return parts.join('.');
        }
        return 0;
    }
/* 文本框根据输入内容自适应高度
* @param                {HTMLElement}        输入框元素
* @param                {Number}                设置光标与输入框保持的距离(默认0)
* @param                {Number}                设置最大高度(可选)
*/
var autoTextarea = function (elem, extra, maxHeight) {
    extra = extra || 0;
    var isFirefox = !!document.getBoxObjectFor || 'mozInnerScreenX' in window,
    isOpera = !!window.opera && !!window.opera.toString().indexOf('Opera'),
            addEvent = function (type, callback) {
                    elem.addEventListener ?
                            elem.addEventListener(type, callback, false) :
                            elem.attachEvent('on' + type, callback);
            },
            getStyle = elem.currentStyle ? function (name) {
                    var val = elem.currentStyle[name];
 
                    if (name === 'height' && val.search(/px/i) !== 1) {
                            var rect = elem.getBoundingClientRect();
                            return rect.bottom - rect.top -
                                    parseFloat(getStyle('paddingTop')) -
                                    parseFloat(getStyle('paddingBottom')) + 'px';        
                    }
 
                    return val;
            } : function (name) {
                            return getComputedStyle(elem, null)[name];
            },
            minHeight = parseFloat(getStyle('height'));
 
    elem.style.resize = 'none';
 
    var change = function () {
            var scrollTop, height,
                    padding = 0,
                    style = elem.style;
 
            if (elem._length === elem.value.length) return;
            elem._length = elem.value.length;
 
            if (!isFirefox && !isOpera) {
                    padding = parseInt(getStyle('paddingTop')) + parseInt(getStyle('paddingBottom'));
            }
            scrollTop = document.body.scrollTop || document.documentElement.scrollTop;
 
            elem.style.height = minHeight + 'px';
            if (elem.scrollHeight > minHeight) {
                    if (maxHeight && elem.scrollHeight > maxHeight) {
                            height = maxHeight - padding+10;
                            style.overflowY = 'auto';
                    } else {
                            height = elem.scrollHeight - padding+10;
                            style.overflowY = 'hidden';
                    }
                    style.height = height + extra + 'px';
                    scrollTop += parseInt(style.height) - elem.currHeight;
                    document.body.scrollTop = scrollTop;
                    document.documentElement.scrollTop = scrollTop;
                    elem.currHeight = parseInt(style.height);
            }
    }
 
    addEvent('propertychange', change);
    addEvent('input', change);
    addEvent('focus', change);
    change();
};

export{
    numberFormat,
    endWith,
    startWith,
    replaceAll,
    GetAtPara,
    valitationBefore,
    valitationAfter,
    addplaceholder,
    clearNoNum,
    FormatMoney,
    limitLength,
    autoTextarea,
    formatNumber



}