javascript - 在 Javascript 中访问变量

Question

我有以下代码:

function getLocation() {
    if (navigator.geolocation) {
        navigator.geolocation.getCurrentPosition(showPosition);
    } 
    else { 
        alert('Geolocation is not supported by this browser');
    }
}
function showPosition(position) {
    alert(position.coords.latitude + ' ' + position.coords.longitude);
    var Loc = position.coords.latitude + ' ' + position.coords.longitude;
}

我需要能够在函数外部或通过 GetLocation 函数访问 Loc 变量。因为我需要将其绑定(bind)到我正在创建的网格中，以便为异地员工存储上类和下类信息。

这是使用变量 Loc 的代码

getLocation();                      
                    var rowId=timesheetGrid.uid();
                    var pos = timesheetGrid.getRowsNum();
                    timesheetGrid.addRow(rowId,["","","","<?php echo $ActiveWeek; ?>","","","","","","","","","","",Loc],0); //adds a new row with pre filled data
                    timesheetGrid.selectCell(rowId,0,false,true,true); // Focus on the new row  

任何帮助将不胜感激

Answer 1

navigator.geolocation.getCurrentPosition() 工作在异步模式，函数 showPosition(position) 是用于捕获位置的回调函数。所以你需要将所有与位置相关的代码放在这个回调函数中。例如，您可以这样做:

function getLocation() {
    if (navigator.geolocation) {
        navigator.geolocation.getCurrentPosition(whenWeGetPosition);
    } 
    else { 
        alert('Geolocation is not supported by this browser');
    }
}
function whenWeGetPosition(position) {
    // your code to use position
    var rowId=timesheetGrid.uid();
    var pos = timesheetGrid.getRowsNum();
    timesheetGrid.addRow(rowId,["","","","<?php echo $ActiveWeek; ?>","","","","","","","","","","",Loc],0); //adds a new row with pre filled data
    timesheetGrid.selectCell(rowId,0,false,true,true); // Focus on the new row  
}

getLocation();