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Vscode扩展在函数外使用变量

vscode-extensions visual-studio-code javascript

UnpassableWizard · 技术社区 · 6 年前

你好,在vscode里扩展.js我不能在变量“chunk”所在的函数之外使用它:

let http = require('http');
let keyname = "key.key";
http.get('http://mysite.nl/vscode/?with=data', function(res) {
  res.on("data", function(chunk) {
    vscode.window.showInformationMessage("INSIDE: " + chunk);
  });
});
vscode.window.showInformationMessage("OUSIDE FUNCTION:" + chunk); /*this does not work*/

let globalvar;
let http = require('http');
let keyname = "key.key";
http.get('http://mysite.nl/vscode/?with=data', function(res) {
  res.on("data", function(chunk) {
    vscode.window.showInformationMessage("INSIDE: " + chunk);
    globalvar = chunk;
  });
});
vscode.window.showInformationMessage("OUSIDE FUNCTION:" + globalvar); /*this does not work*/

1 回复 | 直到 6 年前

Álvaro González 6 年前

function foo(bar) {
    console.log("Inside function: %s", typeof bar);
    function inner(){
      console.log("In function's scope: %s", typeof bar);
    }
    inner();
}

foo("Hi");
console.log("Elsewhere: %s", typeof bar);

其次, http.get() 开始在另一个线程中获取URL,并继续执行程序的其余部分,即调用 vscode.window.showInformationMessage() 如果后来成功了 function(chunk) {} 太晚了!

let globalvar;
window.setTimeout(function (chunk){
    console.log("Done! Chunk is %s", chunk);
    globalvar = chunk;
}, 2000, "Hi!");
console.log("Chunk? %s", typeof globalvar);