Question

这是我的代码示例。我想在if/else块中使用现有的try-catch语句，并在验证失败时推送。我正在尝试在try-catch之间使用if/else，这给我一个错误。

var errLogs = [];
try {
  var a = "ABCD";
  if(typeof a === "string"){
     console.log("equel");
  }catch(e) {
  }else{
     console.error("not equel");
  }
  console.log(e);
  errLogs.push(e);
}

Answer 1

您的Block尚未关闭。

var errLogs = [];

try {
  var a = "ABCD";

  if(typeof a === "string"){
    console.log("equel");
}
}catch(e) {
         }else{
         console.error("not equel");
        }
        console.log(e);
        errLogs.push(e);
}

Answer 2

您可以抛出一个新错误以直接转到catch，例如：

var errLogs = [];

try {
  var a = "ABCD";   // or, test it with number 123

  if (typeof a === "string") {
    console.log("equel");
  } else {
    throw new TypeError("not equel")
  }

} catch (e) {
  console.log(e);
  errLogs.push(e);
}

演示：

var errLogs = [];

function testString(value) {
  try {
    if (typeof value === "string") {
      console.log("equel");
    } else {
      throw new TypeError("not equel")
    }

  } catch (e) {
    console.log(e.message);
    errLogs.push(e.message);
  }
}


testString('ABCD');
console.log('Now testing with number --->')
testString(123);

Answer 3

像这样更新您的代码

var errLogs = [];

try {
  var a = "ABCD";
  if(typeof a === "string"){
    console.log("equel");
  }
  else{
    console.error("not equel");
    //you dont need else there- once exception is thrown, it goes into catch automatically
  }
}catch(e) {
        console.log(e);
        errLogs.push(e);
}

如果里面的其他语句尝试捕获Javascript

3 个答案: