Question

我试图在屏幕上逐渐显示文字（如选框）。例如H ..他......地狱..你好。当我在VS2010的调试中跟踪它时，它正在工作！但是当它实际运行时，它会立即显示整个句子。

我在每个字母之间做了一个“延迟”约3秒，所以它会假设需要一段时间，但实际上它会立即显示所有内容。

谁是解开这个谜团的天才？（请不要给我建议如何创建选框效果，这不再是问题了。现在它只是我和javascript之间的一个WAR！）我假设它在从函数调用函数时与同步有关吗？

感谢任何帮助我恢复理智的人。

你可以从这里下载代码（VS项目）： http://pcgroup.co.il/downloads/misc/function_from_function.zip

或在此查看：

       <body>
        <script type="text/javascript">

//trying to display this source sentence letter by letter:
        var source = "hi javascript why are you being such a pain";
        var target = "";
        var pos = 0;
        var mayGoOn = false;

    //this function calls another function which suppose to "build" the sentence increasing index using the global var pos (it's even working when following it in debug)
     function textticker() {
                if (pos < source.length) {
                    flash();

                    if (mayGoOn == true) {
                        pos++;
                        mayGoOn = false;
                        document.write(target);

                        textticker();
                    }
                }
            }
            function flash() {

    //I tried to put returns everywhere assuming that this may solve it probably one of them in not necessary but it doesn't solve it
                if (mayGoOn == true) { return; }

                while (true) {
                    var d = new Date();
                    if (d.getSeconds() % 3 == 0) {
                        //alert('this suppose to happen only in about every 3 seconds');
                        target = source.substring(0, pos);
                        mayGoOn = true;
                        return;
                    }
                }
            }


            textticker();


        </script>

Answer 1

你显然做错了。看看这个。

var message = "Hello World!";

function print(msg, idx) {
  if(!idx) {
    idx = 0;
  }

  $('#hello').html(msg.substring(0, idx));

  if(idx < msg.length) {
    setTimeout(function() { print(msg, idx + 1) }, 200);
  }
}

print(message);

演示：http://jsbin.com/evehus

从函数WEIRD RESULTS调用函数

1 个答案: