未捕获的ReferenceError: x未定义。

So jsLint says my x is not defined. I looked it up everywhere but I cant find how to define it...

jsLint说x没有定义。我到处都找过了，但是我找不到如何定义它……

for (x = 0; x < verdachten.length; x++) {
       console.log("De verdachte is de  " + verdachten[x].leeftijd + "jaar oud " + verdachten[x].naam  + ", de " + verdachten[x].wie);
    }

That's where it goes wrong. The x...

这就是问题所在。x……

2 个解决方案

#1

This is a case of jsLint being a bit overcautious. Most browsers will automagically define the x, but jsLint warns of this as it's easy to get a scoping bug if you don't properly init your variables, like this:

这是jsLint有点过于谨慎的例子。大多数浏览器将自动定义x，但jsLint对此提出警告，因为如果不正确初始化变量，很容易出现一个范围界定错误，如下所示:

for( var x = 0; x < verdachten.length; x++ ) {
  console.log(
    "De verdachte is de " +
    verdachten[x].leeftijd +
    "jaar oud " +
    verdachten[x].naam +
    ", de " +
    verdachten[x].wie
  );
}

Problems can arise if you have an x defined somewhere else within scope:

如果x在范围内的其他地方被定义为:

function doStuff() {
  var x = "derp";

  // things
  console.log(x); //=> "derp";

  for(x = 0; x < 100; x++) {
    // other things
    console.log(x);//=> 0..99
  }

  console.log(x); //=> 99
  // original x variable has now changed :(
}

#2

for (var x = 0; x < verdachten.length; x++) {
       console.log("De verdachte is de  " + verdachten[x].leeftijd + "jaar oud " + verdachten[x].naam  + ", de " + verdachten[x].wie);
    }

for (var x = 0; x < verdachten.length; x++) {

对于(var x = 0;x < verdachten.length;x + +){

You have the problem in defining the variable 'x'. In javascript variables are defined by prefix var and do not require variable type.

在定义变量x时遇到了问题。在javascript中，变量由前缀var定义，不需要变量类型。

Happy Programming :)

编程:快乐)

#1

for( var x = 0; x < verdachten.length; x++ ) {
  console.log(
    "De verdachte is de " +
    verdachten[x].leeftijd +
    "jaar oud " +
    verdachten[x].naam +
    ", de " +
    verdachten[x].wie
  );
}