javascript.click（函数（）未运行

我已经在javascript中为单击ahref链接创建了此函数

$(document).ready(function() {
    $("#ProcessCharges").click(function() {
        alert("testing");
        if($("#customerbilling_unitprice").val() == "") {
            alert("Please Enter a Unit Price");
            return false;
        }
        if($("#customerbilling_resellercost").val() == "") {
            alert("Please Enter a Reseller Unit Price");
            return false;
        }
        if($("#customerbilling_todate").val() == "") {
            alert("Please Enter a To Date");
            return false;
        }
        if($("#customerbilling_fromdate").val() == "") {
            alert("Please Enter a From Date");
            return false;
        }

        //work out number of days between the two dates
        var tDate = new Date($("#customerbilling_todate").val());
        var fDate = new Date($("#customerbilling_fromdate").val());
        var diff=tDate-fDate;
        var days_between= diff / 1000 / 60 / 60 / 24;

        //do the cost per month times 12 (months)
        var year_cost = $("#customerbilling_unitprice").val() * 12;
        // RESELLER //
        var year_cost_reseller = $("#customerbilling_resellercost").val() * 12;
        // RESELLER //

        //do the yearly cost / 365
        //this will give the daily cost
        var daily_cost = year_cost / 365;
        // RESELLER //
        var daily_cost_reseller = year_cost_reseller / 365;
        // RESELLER //

        //check number of days
        alert(days_between);
        if(days_between == '29' or days_between == '30' or days_between == '31' or days_between == '0') {
            //its a FULL month
            var total_cost = parseFloat( $("#customerbilling_unitprice").val().toFixed(2) );
            // RESELLER //
            var total_cost_reseller = parseFloat( $("#customerbilling_resellercost").val().toFixed(2) );
            // RESELLER //
        } else {
            //now do the daily cost times cost_per_month
            var total_cost = daily_cost * days_between;
            var total_cost = parseFloat( total_cost.toFixed(2) );
            // RESELLER //
            var total_cost_reseller = daily_cost_reseller * days_between;
            var total_cost_reseller = parseFloat( total_cost_reseller.toFixed(2) );
            // RESELLER //
        }

        $("#customerbilling_unitprice").val(total_cost);
        $("#customerbilling_resellercost").val(total_cost_reseller);
    });
});

但是，当单击链接时，该功能没有运行。它应该做的第一件事是显示它没有执行的警报框

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我在这里创建了一个提琴来显示完整的代码：

您使用的语法不正确。 更换您的状况

if(days_between == '29' or days_between == '30' or days_between == '31' or days_between == '0') {

到

应改为

if(days_between == '29' || days_between == '30' || days_between == '31' || days_between == '0') {

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调试javascript的第一项工作：检查控制台。未捕获的语法错误：意外的标识符。如果在if条件中使用或作为关键字，则使用| |代码中有错误！修改后的代码

if(days_between == '29' or days_between == '30' or days_between == '31' or days_between == '0') {

if(days_between == '29' || days_between == '30' || days_between == '31' || days_between == '0') {