var db_server = "primary";
var that = this;
var startServerWith = function(db_server) {
try {
console.log(that.db_server);
console.log(db_server);
// start
} catch (err) {
console.log("Sever failed " , err.message);
}
};
startServerWith("secondary");
返回:
undefined
secondary
我如何访问专利变量db_server数据("主要").在(NodeJS)中的函数
在javascript中无法访问阴影变量(除了特殊情况,例如全局变量)。
如果您需要访问两个变量,请不要将它们命名为相同的名称。
var main = function() {
db_server = "primary";
var that = this;
var startServerWith = function(db_server) {
try {
console.log(that.db_server);
console.log(db_server);
// start
} catch (err) {
console.log("Sever failed " , err.message);
}
};
startServerWith("secondary");
}
main();
返回:
primary
secondary