javascript 易忘备留

1.jQuery.validate验证：

• <input type="file" id="avatar" name="avatar" class="{validate:{required:true,accept:true}}" />   
• accept接受的是：image (png, jpg, jpeg, gif)   
•   
• <input type="file" id="cv" name="cv" class="{validate:{required:true,accept:'docx?|txt|pdf'}}" />   
• accept接受的是：document (doc, docx, txt, pdf)

a.rule.max:function(){}

                rules: {

                    TakeMoney: {

                        required: true,

                        digits: true,

                        max: function (value) {

                            var num = parseInt($("#balance").val());

                            if (isNaN(num)) return 9999999;

                            else return num;

                        }

                    },

                },

         b.异步验证：异步验证的页面只能返回”true”或”false”[字符串]（没试过bool和int类型的）

                    UserName: {

                        required: true,

                        userNameCheck: true,

                        remote: {

                            url: "/BPAjax/CheckUserNameIsExists",

                            type: "post"

                        }

                    },

         c.自定义验证

// 中文字两个字节
jQuery.validator.addMethod("byteRangeLength", function(value, element, param) {
    var length = value.length;
    for(var i = 0; i < value.length; i++){
        if(value.charCodeAt(i) > 127){
            length++;
        }
    }
  return this.optional(element) || ( length >= param[0] && length <= param[1] );   
}, $.validator.format("请确保输入的值在{0}-{1}个字节之间(一个中文字算2个字节)"));

// 邮政编码验证   
jQuery.validator.addMethod("isZipCode", function(value, element) {   
    var tel = /^[0-9]{6}$/;
    return this.optional(element) || (tel.test(value));
}, "请正确填写您的邮政编码");

 2.原型扩展

a. //格式化日期
Date.prototype.format = function (format) {
    /*
    * eg:format="YYYY-MM-dd hh:mm:ss";
    */
    var o = {
        "M+": this.getMonth() + 1,  //month
        "d+": this.getDate(),     //day
        "h+": this.getHours(),    //hour
        "m+": this.getMinutes(),  //minute
        "s+": this.getSeconds(), //second
        "q+": Math.floor((this.getMonth() + 3) / 3),  //quarter
        "S": this.getMilliseconds() //millisecond
    }

    if (/(y+)/.test(format)) {
        format = format.replace(RegExp.$1, (this.getFullYear() + "").substr(4 - RegExp.$1.length));
    }

    for (var k in o) {
        if (new RegExp("(" + k + ")").test(format)) {
            format = format.replace(RegExp.$1, RegExp.$1.length == 1 ? o[k] : ("00" + o[k]).substr(("" + o[k]).length));
        }
    }
    return format;
}

范例：///获取当前日期
function getCurrentDate() {
    var date = new Date();
    return date.format("yyyy-MM-dd");
}

b.字符串格式化

// 字符串格式化 调用方式同C#

String.prototype.format = function () {
    var args = arguments;
    return this.replace(/\{(\d+)\}/g,
        function (m, i) {
            return args[i];
        });
}

c.字符串截取、长度、移除所有空格（字节长度，双字节占2个）

//首尾空格截取
String.prototype.trim = function() {return this.replace(/(^\s*)|(\s*$)/g, "");}
//获取字节长度
String.prototype.len = function() { return this.replace(/[^\x00-\xff]/g, "aa").length; }
//去除字符串中所有空格
function removeAllSpace(str) {  return str.replace(/\s+/g, "");}

3.其他

a.//获取URL传递参数

Request = {
    QueryString: function (item) {
        var svalue = location.search.match(new RegExp("[\?\&]" + item + "=([^\&]*)(\&?)", "i"));
        return svalue ? svalue[1] : svalue;
    }
}

b.检测类型

var str = 'str';
    var arr = new Array();
    var num = 0;
    var bool = true;
    var obj = {};
    var re = /^[0-9]/;
    

    getType(re); // 'regexp'
    getType(str); // 'string'
    getType(arr); // 'array'
    getType(num);  // 'number'
    getType(bool); // 'boolean'
    getType(obj); // 'object'
    getType(window.aa); // 'undefined'
    getType(undefined); // 'undefined'
    getType(null); // 'null'

function getType (o) { /* 检测数据类型函数 */
        return Object.prototype.toString.call(o).slice(8,-1).toLowerCase();        
    }