Question

我正在agularJS中迈出第一步，并试图在函数中创建一个静态变量。该函数获取一个名为cron_format的变量，我希望该函数保存该值。 thee函数检查用户是否更改了cron_format的值，如果是，则发布数据。这是功能：

   $scope.saveCron = function(userId,scriptId,cronFormat,letter,comp,index){

        //split cronFormat to match the value in the table, and than save changes
        var newCron =  $scope.split(cronFormat);
        newCron[index] = letter;

        //remove commas to match the cron's format
        newCron = newCron.toString().replace(/,/g, " ");

        if(letter!=comp) {
            $.post("updateCronChange.php", "user_id=" + userId + "&script_id=" + scriptId + "&cron_format=" + newCron, function (data) {
                console.log("cron changed to: "+newCron);
            });
        }
    }

我想存储变量newCron，以便下次调用函数时，cronFormat将等于上次执行时的newCron ...任何帮助PLZ？

Answer 1

使用函数“关闭”外部范围变量的事实，并创建一个来存储以前的值。

var prevCron; // Define a variable to hold the value between function calls.

$scope.saveCron = function(userId,scriptId,cronFormat,letter,comp,index){

    //split cronFormat to match the value in the table, and than save changes
    var newCron =  $scope.split(cronFormat);
    newCron[index] = letter;

    //remove commas to match the cron's format
    newCron = newCron.toString().replace(/,/g, " ");

    if(letter!=comp) {
        $.post("updateCronChange.php", "user_id=" + userId + "&script_id=" + scriptId + "&cron_format=" + newCron, function (data) {
            console.log("cron changed to: "+newCron);
        });
    }

    // Use the outer variable to store our current value.
    prevCron = newCron;
}

在angularJS中定义函数内的静态变量

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