我有一個函數並創建了一個全局變量。Javascript全局變量爲空
函數內部的警報正在按照預期提醒結果,但變量沒有顯示任何內容。
我該如何解決這個問題?
下面的代碼:
var connectionResult = '';
function checkConnection() {
var networkState = navigator.connection.type;
var states = {};
states[Connection.UNKNOWN] = 'Unknown connection';
states[Connection.ETHERNET] = 'Ethernet connection';
states[Connection.WIFI] = 'WiFi connection';
states[Connection.CELL_2G] = 'Cell 2G connection';
states[Connection.CELL_3G] = 'Cell 3G connection';
states[Connection.CELL_4G] = 'Cell 4G connection';
states[Connection.CELL] = 'Cell generic connection';
states[Connection.NONE] = 'No network connection';
alert('Connection type: ' + states[networkState]);
var connectionResult = states[networkState];
};
checkConnection();
alert(connectionResult); // Returns Nothing
確實。或者更好的辦法是讓'checkConnection' *返回它,並將結果分配給全局(理想情況下它不再是全局的)。 –
Good call @ T.J.Crowder,我用你的建議更新了我的答案。 – syazdani