javascript使用带有循环的settimeout()

Question

我得到了一张包含8x10单元格的表。。每个销售都有一个带有自己id的输入元素（11，12，…，21，22，23，…）现在我想在之后（比如0.5秒）填充这些输入我刚输入了一些测试的值

        Betrag = new Array();
        Betrag[0] = new Array();
        Betrag[1] = new Array("asd","asd","asd","asd","asd","asd","asd","asd","asd","asd","513.000,00");
        Betrag[2] = new Array("asd","adsd","asd","asd","asd","asd","asd","asd","asd","asd","asd");
        Betrag[3] = new Array("asd","asd","asd","asd","asd","asd","asd","asd","asd","asd","asd");
        Betrag[4] = new Array("asd","uisgui","asd","asd","asd","asd","asd","asd","asd","asd","asd");
        Betrag[5] = new Array("asd","asd","asd","asd","asd","asd","asd","asd","asd","asd","asd");
        Betrag[6] = new Array("asd","asd","asd","asd","asd","asd","asd","asd","asd","asd","asd");
        Betrag[7] = new Array("asd","asd","asd","asd","asd","asd","asd","asd","asd","asd","asd");
        Betrag[8] = new Array("asd","asd","asd","asd","asd","asd","asd","asd","asd","asd","asd");
          for(i=1; i<=8; i++){
            for(k=1; k<=10; k++){
              setTimeout(function schreiben(){document.getElementById(''+i+k+'').value= Betrag[i][k];}, 1000);
              //document.getElementById(''+i+k+'').value= Betrag[i][k];
            }
          }

编译器说"TypeError:无法读取未定义的属性"11"

如果我不使用settimeout（）函数，整个循环都可以正常工作，但使用此函数时我犯了这个错误。。

Answer 1

您可以尝试以下操作：

    var i = 1;
    var k = 1;
    var obj = setInterval( function () {
        document.getElementById(i + '' + k).value= Betrag[i][k];
        if(k <= 10)
           k++;
        else
        {
            k = 1;
            if(i<=8)
                 i++;
            else
                 clearInterval(obj);
        }
    }, 1000);

以下是上的运行示例http://jsfiddle.net/Ex98V/

Answer 2

这应该按照您想要的方式工作。

for(i=1; i<=8; i++){
    for(k=1; k<=10; k++){
        (function(i, k){
            setTimeout(function schreiben(){document.getElementById(''+i+k+'').value= Betrag[i][k];}, 1000*k + 10000*i);
            //document.getElementById(''+i+k+'').value= Betrag[i][k];
        })(i, k);
    }
}

为了让事情变得更清楚，可以考虑这样的重构：

for(i=1; i<=8; i++){
    for(k=1; k<=10; k++){
        setSchreibTimeout(i, k);
    }
}
function setSchreibTimeout(i, k){
    setTimeout(function schreiben(){document.getElementById(''+i+k+'').value= Betrag[i][k];}, 1000*k + 10000*i);
    //document.getElementById(''+i+k+'').value= Betrag[i][k];
}

Answer 3

k和i在for循环结束后读取（准确地说是1秒）。它们的值分别为9和11，从而导致数组溢出问题。

修复它的一个选项是创建一个完成工作的函数，并从k和i变量创建一个固定字符串来调用它：

function schreiben(__i, __k) {
   document.getElementById(''+__i+__k+'').value= Betrag[__i][__k];
}

然后这样调用setTimeout：

setTimeout("schreiben("+i+","+k+")", 1000);

不是最优雅的方式，但它很有效。