Question

1）我的计时器有问题。它在屏幕加载时启动，它应该从按钮START开始。 2）如果没有。当计时器到达00:00时，如果我赢了或输了，它应该显示消息（警报）。 http://prntscr.com/ffi4bu墙值不断变化。我的代码没有用，但你明白了。

1）JS代码计时器

function startTimer(duration, display) {
  var timer = duration,minutes, seconds;
 var timers = setInterval(runner, 1000);
 function runner() {
    minutes = parseInt(timer / 60, 10);
    seconds = parseInt(timer % 60, 10);

    minutes = minutes < 10 ? "0" + minutes : minutes;
    seconds = seconds < 10 ? "0" + seconds : seconds;

    display.textContent = minutes + ":" + seconds;

    if (--timer < 0) {
       clearInterval(timers)
    }
  }

}

window.onload = function() {
  var oneMinutes = 60 * 1,
    display = document.querySelector('#time');
  startTimer(oneMinutes, display);
};

HTML

<div class="timer" ><b>Battle time: <span id="time"></span></b></div>
<BUTTON class="begin" onclick="startTimer(60,document.querySelector('#time'))"><b>START</b></BUTTON>

2）JS

function finish(){
    var g = function startTimer;
    var h = document.getElementById('wallvalue');

if (function startTimer = 0 )&& ( h<500 ) {
    alert("You won!");
}
 else {
 alert("You lost!");
}
}

Answer 1

如果要在按钮单击时调用，请从window.onload中删除startTimer函数调用。否则它将在窗口加载后立即加载。

window.onload = function() {
  var oneMinutes = 60 * 1,
  display = document.querySelector('#time');
  //startTimer(oneMinutes, display); 
};

在startTimer内部对“零”值调用完成并从完成中删除不明确的函数调用行。还要检查“h”，因为当定时器值已经为零时将调用“finsh”。

function startTimer(duration, display) {
  var timer = duration,minutes, seconds;
  var timers = setInterval(runner, 1000);
  function runner() {
    minutes = parseInt(timer / 60, 10);
    seconds = parseInt(timer % 60, 10);

    minutes = minutes < 10 ? "0" + minutes : minutes;
    seconds = seconds < 10 ? "0" + seconds : seconds;

    display.textContent = minutes + ":" + seconds;

    if (--timer <= 0) {
     clearInterval(timers)
     finish()
   }
 }

}



function finish(){

var h = document.getElementById('wallvalue');

if ( h<500 ) {
    alert("You won!");
}
 else {
 alert("You lost!");
}
}

JS if else语句和计时器

1 个答案: