finally语句

 

    finally语句不论之前的try和catch中是否产生异常都会执行该代码块。

 

    实例

 

function myFunction() {

 

  var message, x;

 

  message = document.getElementById("p01");

 

  message.innerHTML = "";

 

  x = document.getElementById("demo").value;

 

  try { 

 

    if(x == "") throw "值是空的";

 

    if(isNaN(x)) throw "值不是一个数字";

 

    x = Number(x);

 

    if(x > 10) throw "太大";

 

    if(x < 5) throw "太小";

 

  }

 

  catch(err) {

 

    message.innerHTML = "错误: " + err + ".";

 

  }

 

  finally {

 

    document.getElementById("demo").value = "";

 

  }

 

}