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我有一个 javascript 游戏，它会提示“游戏结束！” 当满足游戏结束条件时，即一个距离大于另一个距离。距离越来越大，因此一次又一次地满足条件，浏览器要求“防止从其他对话框创建此页面”。F5当我单击确定并使用或刷新浏览器时Ctrl+ F5。“游戏结束！” 警报不再出现，必须重新启动浏览器。要么我必须在游戏结束时暂停游戏中的所有内容，要么在页面刷新时以某种方式启用 alert()。

很高兴你的提示！下面是我的代码：

function run(t) {
   requestAnimationFrame(run);
   if (t === undefined) {
      t=0;
   }
   var h = t - tprev;   // time step 
   tprev = t;


   SmileyApp.xpos += SmileyApp.xspeed * h/1000;  // update position according to constant speed for Yellow Smiley
   SmileyApp.ypos += SmileyApp.yspeed * h/1000;  // update position according to constant speed

    for (var i=0; i<SmileyReds.length; i++){
   SmileyReds[i].xpos += SmileyReds[i].xspeed * h/1000;  // update position according to constant speed for Red Smileys
   SmileyReds[i].ypos += SmileyReds[i].yspeed * h/1000;  // update position according to constant speed
    }
   // Yellow Smiley edge hit control
   if (lineDistance(350, 350, SmileyApp.xpos, SmileyApp.ypos) + SmileyApp.radius > 300) {
     alert("Game Over");
     //swal("Game Over");
     //break;
     //Object.freeze(canvas);
     fade(canvas);
   }

    for (var i=0; i<SmileyReds.length; i++){
      if (lineDistance(350, 350, SmileyReds[i].xpos, SmileyReds[i].ypos) + SmileyReds[i].radius > 300) {
      // Red Smiley collusion with circle edge
      // bounce formula : v2 = v1 − [2 (n · v1) n]

        nx = 350 -  SmileyReds[i].xpos ;
        ny = 350 -  SmileyReds[i].ypos ;
        var len = Math.sqrt(nx * nx + ny * ny)
        nx = nx / len;
        ny = ny / len;
      //new calc
       v_newx = SmileyReds[i].xspeed - (2 *( nx * SmileyReds[i].xspeed + ny * SmileyReds[i].yspeed ) ) * nx;
       v_newy = SmileyReds[i].yspeed - (2 *( nx * SmileyReds[i].xspeed + ny * SmileyReds[i].yspeed ) ) * ny;

       SmileyReds[i].xspeed = v_newx;
       SmileyReds[i].yspeed = v_newy;
        }
        // Red - Yellow Smiley collusion
     if (lineDistance(SmileyApp.xpos, SmileyApp.ypos, SmileyReds[i].xpos, SmileyReds[i].ypos) < 2*SmileyApp.radius ) {
        alert("Game Over");
        }

    }// for loop end

   // redraw smileys at new position
   ctx.clearRect(0,0,canvas.height, canvas.width);
   drawBigCircle();
   drawSmiley(SmileyApp.xpos, SmileyApp.ypos, SmileyApp.radius);

   for (var i=0; i<SmileyReds.length; i++){
   drawSmileyRed(SmileyReds[i].xpos, SmileyReds[i].ypos, SmileyReds[i].radius);
   }
}
4

1 回答 1

1

在函数顶部附近定义一个变量：

var gameHasEnded = false;

然后，用它来判断游戏是否已经结束：

if (lineDistance(350, 350, SmileyApp.xpos, SmileyApp.ypos) + SmileyApp.radius > 300) {
    if (! gameHasEnded) {
        gameHasEnded = true;
        alert("Game Over");
        fade(canvas);
    }
}
于 2016-02-10T13:31:55.967 回答