javascript：想要调整窗口大小，但还要检查它是打开还是关闭

Question

为什么这不起作用？

//我删除了'for循环'一秒钟然后脚本做了一些事情，循环有什么问题？//

var openWindows= new Array[50]();

function resize(x){

//将布尔值更改为var var open = false;

 for(var i = 0; i < openWindows.length; i++){
  if(openWindows[i] == x){
   open = true;
   openWindows[i] = "";
  }
 }

 if(open == false){
  for(var i = 0; i < openWindows.length; i++){
   if(openWindows[i] == ""){
    openWindows[i] = x;
    break;
   }
  }

  var t = setTimeout("document.getElementById('" + x + "').style.height='200px'",20);
  var t = setTimeout("document.getElementById('" + x + "').style.height='220px'",40);
  var t = setTimeout("document.getElementById('" + x + "').style.height='240px'",60);
  var t = setTimeout("document.getElementById('" + x + "').style.height='260px'",80);
  var t = setTimeout("document.getElementById('" + x + "').style.height='280px'",100);
  var t = setTimeout("document.getElementById('" + x + "').style.height='300px'",120);
  var t = setTimeout("document.getElementById('" + x + "').style.height='320px'",140);
  var t = setTimeout("document.getElementById('" + x + "').style.height='340px'",160);
  var t = setTimeout("document.getElementById('" + x + "').style.height='360px'",180);
  var t = setTimeout("document.getElementById('" + x + "').style.height='380px'",200);
  var t = setTimeout("document.getElementById('" + x + "').style.height='400px'",220);
  var t = setTimeout("document.getElementById('" + x + "').style.height='420px'",240);
  var t = setTimeout("document.getElementById('" + x + "').style.height='440px'",260);
  var t = setTimeout("document.getElementById('" + x + "').style.height='460px'",280);
  var t = setTimeout("document.getElementById('" + x + "').style.height='480px'",300);
  var t = setTimeout("document.getElementById('" + x + "').style.height='500px'",320);
  var t = setTimeout("document.getElementById('" + x + "').style.height='520px'",340);
  var t = setTimeout("document.getElementById('" + x + "').style.height='540px'",360);
  var t = setTimeout("document.getElementById('" + x + "').style.height='560px'",380);
  var t = setTimeout("document.getElementById('" + x + "').style.height='580px'",400);
 }else{
  var t = setTimeout("document.getElementById('" + x + "').style.height='560px'",40);
  var t = setTimeout("document.getElementById('" + x + "').style.height='540px'",60);
  var t = setTimeout("document.getElementById('" + x + "').style.height='520px'",80);
  var t = setTimeout("document.getElementById('" + x + "').style.height='500px'",100);
  var t = setTimeout("document.getElementById('" + x + "').style.height='480px'",120);
  var t = setTimeout("document.getElementById('" + x + "').style.height='460px'",140);
  var t = setTimeout("document.getElementById('" + x + "').style.height='440px'",160);
  var t = setTimeout("document.getElementById('" + x + "').style.height='420px'",180);
  var t = setTimeout("document.getElementById('" + x + "').style.height='400px'",200);
  var t = setTimeout("document.getElementById('" + x + "').style.height='380px'",220);
  var t = setTimeout("document.getElementById('" + x + "').style.height='360px'",240);
  var t = setTimeout("document.getElementById('" + x + "').style.height='340px'",160);
  var t = setTimeout("document.getElementById('" + x + "').style.height='320px'",260);
  var t = setTimeout("document.getElementById('" + x + "').style.height='300px'",280);
  var t = setTimeout("document.getElementById('" + x + "').style.height='280px'",300);
  var t = setTimeout("document.getElementById('" + x + "').style.height='260px'",320);
  var t = setTimeout("document.getElementById('" + x + "').style.height='240px'",340);
  var t = setTimeout("document.getElementById('" + x + "').style.height='220px'",360);
  var t = setTimeout("document.getElementById('" + x + "').style.height='200px'",380);
  var t = setTimeout("document.getElementById('" + x + "').style.height='180px'",400);
 }
}

Answer 1

您的代码应该做什么还不是很清楚，但我可以看到一些问题。

第一行有语法错误：

var openWindows= new Array[50]();  // Should be `Array(50)`

Javascript是动态类型语言，声明变量时不需要断言类型：

 boolean open = false;

 // Should be
 var open = false;

对于每个变量声明，您应该只使用一次var 关键字。在这种情况下，每次声明 var t = window.setTimeout(...); 时，您都在重新声明变量。事实上，您根本不需要var t =。

此外，您可以使用.closed 属性检查窗口是否已关闭：

if (windowVar.closed == true) { /* ... */ };