实用js片段

算法

//加法    add(10,2)  //12
function add(a, b) {
    var c, d, e;
    try {
        c = a.toString().split(".")[1].length;
    } catch (f) {
        c = 0;
    }
    try {
        d = b.toString().split(".")[1].length;
    } catch (f) {
        d = 0;
    }
    return e = Math.pow(10, Math.max(c, d)), (mul(a, e) + mul(b, e)) / e;
}
//减法   sub(10,2)  //8
function sub(a, b) {
    var c, d, e;
    try {
        c = a.toString().split(".")[1].length;
    } catch (f) {
        c = 0;
    }
    try {
        d = b.toString().split(".")[1].length;
    } catch (f) {
        d = 0;
    }
    return e = Math.pow(10, Math.max(c, d)), (mul(a, e) - mul(b, e)) / e;
}
//乘法   mul(10,2)  //20
function mul(a, b) {
    var c = 0,
        d = a.toString(),
        e = b.toString();
    try {
        c += d.split(".")[1].length;
    } catch (f) { }
    try {
        c += e.split(".")[1].length;
    } catch (f) { }
    return Number(d.replace(".", "")) * Number(e.replace(".", "")) / Math.pow(10, c);
}
//除法   div(10,2)  //5
function div(a, b) {
    var c, d, e = 0,
        f = 0;
    try {
        e = a.toString().split(".")[1].length;
    } catch (g) { }
    try {
        f = b.toString().split(".")[1].length;
    } catch (g) { }
    return c = Number(a.toString().replace(".", "")), d = Number(b.toString().replace(".", "")), mul(c / d, Math.pow(10, f - e));
}

　

验证

// 判断是否是整数
function isInt(num) {
    var reg = new RegExp("^[0-9]*$");
    return reg.test(num);
}

// 判断是否是数字
function isNum(num) {
    var reg = new RegExp("^(\-)?[0-9]+(\.[0-9]+)?$");
    return reg.test(num);
}

// 判断是否是手机号码
function isPhone(phone) {
    var reg = new RegExp("^1[0-9]{10}$");
    return reg.test(phone);
}
//只能输入有两位小数的正实数，多用于价格
function isFloat(num) {
    var reg = new RegExp("^[0-9]+(\\.[0-9]{1,2})?$");
    return reg.test(num);
}
//只能输入有1位小数的正实数，多用于打折
function isFloat1(num) {
    var reg = new RegExp("^[0-9]+(\\.[0-9]{1})?$");
    return reg.test(num);
}

　　

获取当前日期

//获取当前时间年-月-日     getNowTime()   //2017-09-23
function getNowTime() {
    var date = new Date();
    var seperator1 = "-";
    var year = date.getFullYear();
    var month = date.getMonth() + 1;
    var strDate = date.getDate();
    
    var currentdate = year  + seperator1 + checkNum(month) + seperator1 + checkNum(strDate)

    return currentdate;
}

function checkNum(n){
    var num;
    if (n>= 1 && n<= 9) {
        num= "0" + n;
    }
    return num
}

　　

jquery 请求

//通用get请求
function commonGet(url, success, complete) {
    $.ajax({
        url: url,
        type: 'get',
        success: function (resp) {
            if (resp.code == 0) {
                typeof success === "function" && success(resp);
            } else {
                console.log(resp);
                layer.msg(resp.msg);
            }
            typeof complete === "function" && complete(resp);
        },
        error: function () {
            layer.msg('系统错误，请重试！');
            typeof complete === "function" && complete();
        }
    });
}
//通用post请求
function commonPost(url, data, success, complete) {
    setTimeout(function () {
        $(".loading").hide();
    },500)
    $(document).ajaxStart(function () {
        // layer.load(1, { shade: [0.1,'#fff'] })//0.1透明度的白色背景
        $(".loading").show();
    })
    $(document).ajaxSuccess(function () {
        $(".loading").hide();
    })
    $.ajax({
        url: url,
        type: 'post',
        data: data,
        success: function (resp) {
            if (resp.code == 0) {
                typeof success === "function" && success(resp);
            } else {
              //  console.log(resp);
                $(".loading").hide();
                layer.msg(resp.msg);
            }
            typeof complete === "function" && complete(resp);
        },
        error: function (resp) {
            $(".loading").hide();
            layer.msg('系统错误，请重试！');
            typeof complete === "function" && complete();
        }
    });
}

　　

地址参数方法

//http://www.huistd.com/?id=99&ttt=3&haha=33 
// GetQueryString("haha")
//获取地址栏参数
function GetQueryString(name) {
    var reg = new RegExp("(^|&)" + name + "=([^&]*)(&|$)");
    var r = window.location.search.substr(1).match(reg);
    if (r != null) return unescape(r[2]); return null;
}

//changeUrlArg(url, 'haha', 33); // http://www.huistd.com/?id=99&ttt=3&haha=33 
//修改地址栏参数
function changeUrlArg(url, arg, val) {
    var pattern = arg + '=([^&]*)';
    var replaceText = arg + '=' + val;
    return url.match(pattern) ? url.replace(eval('/(' + arg + '=)([^&]*)/gi'), replaceText) : (url.match('[\?]') ? url + '&' + replaceText : url + '?' + replaceText);
}


//获取字符串长度
function getByteLen(val) {
    if (val == null || val == "undefined") return 0;
    return val.length;

}

　　

 js，form表单数据转化为json格式

//自定义函数处理queryParams的批量增加    jsonArr.serializeJsonObject()
$.fn.serializeJsonObject = function () {
    var json = {};
    var form = this.serializeArray();
    $.each(form, function () {
        if (json[this.name]) {
            if (!json[this.name].push) {
                json[this.name] = [json[this.name]];
            }
            json[this.name].push();
        } else {
            json[this.name] = this.value || "";
        }
    });
    return json;
}