44259
下記のコードは、トグルボタンで"マウスストーカー"とマウスポイントを追従，もしくは分離させようと試みた失敗作です。これを成功させるには、どのように書き換えればいいでしょうか。  
うまく行っていたのですが、コードを誤って消してしまい、書き方を忘れてしまいました。  
分かる方は、教えていただけないでしょうか。コードと、問題箇所は、下記の通りです。

```

    <!DOCTYPE html>
    <html>
    <head>
        <style>
            body {
      font-family: Helvetica, Arial, sans-serif;
    }
    
    .Face {
      position: absolute;
      height: 10;
      widdth: 10;
      text-align: center;
      font-size: 1em;
      color: #0000ff;
    }
    
    .Hours {
      position: absolute;
      width: 16px;
      height: 16px;
      font-family: Arial;
      font-size: 16px;
      color: #000000;
      text-align: center;
      font-weight: bold;
    }
    
    .Minutes {
      position: absolute;
      width: 16px;
      height: 16px;
      font-family: Arial;
      font-size: 16px;
      color: #000000;
      text-align: center;
      font-weight: bold;
    }
    
    .Seconds {
      position: absolute;
      width: 16px;
      height: 16px;
      font-family: Arial;
      font-size: 16px;
      color: #ff0000;
      text-align: center;
      font-weight: bold;
    }
    
    .Date {
      position: absolute;
      height: 10;
      width: 10;
      font-size: 1em;
      color: #00ff00;
    }
        </style>
        <script src="/scripts/snippet-javascript-console.min.js?v=1"></script>
        </head>
    <body>
        <div id="clock">
        <div id="Od" style="position:absolute;top:0px;left:0px">
            <div style="position:relative">
            </div>
        </div>
        <div id="Of" style="position:absolute;top:0px;left:0px">
            <div style="position:relative">
            </div>
        </div>
        <div id="Oh" style="position:absolute;top:0px;left:0px">
            <div style="position:relative">
            </div>
        </div>
        <div id="Om" style="position:absolute;top:0px;left:0px">
            <div style="position:relative">
            </div>
        </div>
        <div id="Os" style="position:absolute;top:0px;left:0px">
            <div style="position:relative">
            </div>
        </div>
    </div>
        <script type="text/javascript">
            "use strict";
    
    function $(sel) {
      return document.getElementById(sel);
    }
    
    function $$(sel) {
      return document.getElementsByClassName(sel);
    }
    
    function setPosition(element, y, x) {
      element.style.top = y + 'px';
      element.style.left = x + 'px';
    }
    
    var CLOCK_HEIGHT = 55,
        CLOCK_WIDTH = 55,
        CLOCK_FROM_MOUSE_Y = -200,
        CLOCK_FROM_MOUSE_X = 0;
    
    var H = '✴✴✴',
        H = H.split('');
    var M = '✴✴✴✴',
        M = M.split('');
    var S = '・・・・・',
          S = S.split('');
    var SPEED = 0.4,
        FACES ='✴ ✴ ✴ ✴ ✴ ✴ ✴ ✴ ✴ ✴ ✴ ✴',
        FACES = FACES.split(' ');
    var  HAND_HEIGHT = CLOCK_HEIGHT / 4.5; 
    var  HAND_WIDTH = CLOCK_WIDTH / 4.5;
    var  HAND_Y = -7,
        HAND_X = -2.5,
        STEP = 0.03;
    
    var ymouse = 180,
        xmouse = 520;
    var currStep = 0;
    var lastBasePositions = [];
    
    function initialize() {
      for (var i = 0; i < FACES.length; ++i) {
        lastBasePositions[i] = {x:0, y:0};
      }
    
      var html = '';
      // Face wrapper
      html = '';
      for (var i = 0; i < FACES.length; ++i) {
        html += '<div class="Face">' + FACES[i] + '</div>';
      }
      $('Of').children[0].innerHTML = html;
    
      // Hours wrapper
      html = '';
      for (var i = 0; i < H.length; ++i) {
        html += '<div class="Hours">' + H[i] + '</div>';
      } 
      $('Oh').children[0].innerHTML = html;
    
      // Minute wrapper
      html = '';
      for (var i = 0; i < M.length; ++i) {
        html += '<div class="Minutes">' + M[i] + '</div>';
      }
      $('Om').children[0].innerHTML = html;
    
      // Seconds wrapper
      html = '';
      for (var i = 0; i < S.length; ++i) {
        html += '<div class="Seconds">' + S[i] + '</div>';
      }
      $('Os').children[0].innerHTML = html;
    
    // Mouse move event handler
    function Mouse(evnt) 
    {
        if (typeof evnt === 'undefined')
        {
            ymouse = event.Y + CLOCK_FROM_MOUSE_Y;
            xmouse = event.X + CLOCK_FROM_MOUSE_X;
        }
        else
        {
            ymouse = evnt.clientY + CLOCK_FROM_MOUSE_Y;
            xmouse = evnt.clientX + CLOCK_FROM_MOUSE_X;
        }
      };
      document.onmousemove = null;
      requestAnimationFrame(ClockAndAssign);
    }
    
    var lastYearPositions = [{x:0, y:0}];
    var lastYearString = ' ';
    var lastYearMonthDateDay = '';
    function updateYear(currentDate, scrll) {
      var yearString = lastYearString;
      if (currentDate.getHours() < 12) {
        if (lastYearMonthDateDay != 'wa1')
          yearString = currentDate.toLocaleDateString("ja-JP-u-ca-japanese", { era: "long", year: "numeric", month: "numeric", day: "numeric", weekday: "long"  }).
              replace(/\u200e/g, "").replace(" ", "");
        lastYearMonthDateDay = 'wa1';
      } else {
        if (lastYearMonthDateDay != 'wa2')
          yearString = currentDate.toLocaleDateString("ja-JP-u-ca-japanese", { era: "long", year: "numeric", month: "numeric", day: "numeric", weekday: "long"  }).
              replace(/\u200e/g, "").replace(" ", "");
        lastYearMonthDateDay = 'wa2';
      }
    
      var yearLength = lastYearPositions.length;
      if (yearString != lastYearString) {
        lastYearString = yearString;        
        var yearCharacters = yearString.split('');
        yearLength = yearCharacters.length;
    
        // Date wrapper
        var html = '';
        for (var i = 0; i < yearLength; ++i) {
          html += '<div class="Date">' + yearCharacters[i] + '</div>';
        }
        $('Od').children[0].innerHTML = html;
      }
      var positions = [{}];
      var lastPosition = lastYearPositions[0];
      positions[0].y = lastPosition.y + ((ymouse) - lastPosition.y) * SPEED;
      positions[0].x = lastPosition.x + ((xmouse) - lastPosition.x) * SPEED;
      for (var i = 1; i < yearLength; ++i) {
        lastPosition = i < lastYearPositions.length ?
            lastYearPositions[i] :
            lastYearPositions[lastYearPositions.length - 1];
        positions[i] = {};
        positions[i].y = lastPosition.y + (positions[i-1].y - lastPosition.y) * SPEED;
        positions[i].x = lastPosition.x + (positions[i-1].x - lastPosition.x) * SPEED;
      }
      for (var i = 0; i < yearLength; ++i) {
        var radian = currStep + i * (360 / yearLength) * Math.PI / 180;
        setPosition($$('Date')[i],
                    Math.round(positions[i].y) + CLOCK_HEIGHT * 1.5 * Math.sin(radian) + scrll,
                    Math.round(positions[i].x) + CLOCK_WIDTH * 1.5 * Math.cos(radian));
      }
      lastYearPositions = positions;
      currStep -= STEP;
    }
    
    function ClockAndAssign() {
      var date = new Date();
      var secs = date.getSeconds();
      var sec = -1.57 + Math.PI * secs / 30;
      var mins = date.getMinutes();
      var min = -1.57 + Math.PI * mins / 30;
      var hr = date.getHours();
      var hrs = -1.575 + Math.PI * hr / 6 + Math.PI * parseInt(date.getMinutes(), 10) / 360;
      $('Od').style.top = window.document.body.scrollTop;
      $('Of').style.top = window.document.body.scrollTop;
      $('Oh').style.top = window.document.body.scrollTop;
      $('Om').style.top = window.document.body.scrollTop;
      $('Os').style.top = window.document.body.scrollTop;
      var scrll = 0;
    
      var positions = [{}];
      var lastPosition = lastBasePositions[0];
      positions[0].y = (lastPosition.y + (ymouse - lastPosition.y) * SPEED);
      positions[0].x = (lastPosition.x + (xmouse - lastPosition.x) * SPEED);
      for (var i = 1; i < FACES.length; ++i) {
        lastPosition = lastBasePositions[i];
        positions[i] = {};
        positions[i].y = (lastPosition.y + (positions[i - 1].y - lastPosition.y) * SPEED);
        positions[i].x = (lastPosition.x + (positions[i - 1].x - lastPosition.x) * SPEED);
      }
      lastBasePositions = positions;
    
      var split = 360 / FACES.length;
      for (var i = 0; i < FACES.length; ++i) {
        var radian = -1.0471 + i * split * Math.PI / 180;
        setPosition($$('Face')[i],
                    positions[i].y + CLOCK_HEIGHT * Math.sin(radian) + scrll,
                    positions[i].x + CLOCK_WIDTH * Math.cos(radian));
      }
      for (var i = 0; i < H.length; ++i) {
        setPosition($$('Hours')[i],
                    positions[i].y + HAND_Y + (i * HAND_HEIGHT) * Math.sin(hrs) + scrll,
                    positions[i].x + HAND_X + (i * HAND_WIDTH) * Math.cos(hrs));
      }
      for (var i = 0; i < M.length; ++i) {
        setPosition($$('Minutes')[i],
                    positions[i].y + HAND_Y + (i * HAND_HEIGHT) * Math.sin(min) + scrll,
                    positions[i].x + HAND_X + (i * HAND_WIDTH) * Math.cos(min));
      }
      for (var i = 0; i < S.length; ++i) {
        setPosition($$('Seconds')[i],
                    positions[i].y + HAND_Y + (i * HAND_HEIGHT) * Math.sin(sec) + scrll,
                    positions[i].x + HAND_X + (i * HAND_WIDTH) * Math.cos(sec));
      }
      updateYear(date, scrll);
      requestAnimationFrame(ClockAndAssign);
    }
    
     var vis=true;
      function toggle(){
        vis=!vis;
        document.getElementById("tog").value=vis?"STALK":"breakOFF";
          if(vis){
                ymouse = 180,
                xmouse = 520;
              document.onousemove=Mouse;
        }
          else{
               document.onmousemove=null;
        }
    }
    
    initialize();
        </script>
    
    
      <div style="position:absolute; bottom:15%; width:100%; text-align:center;">
         <input id="tog" type="button" value="STALK" onclick="toggle();">
      </div>
    
    </body>
    </html>
    
```

問題箇所です。

```

    // Mouse move event handler
    function Mouse(evnt) 
    {
        if (typeof evnt === 'undefined')
        {
            ymouse = event.Y + CLOCK_FROM_MOUSE_Y;
            xmouse = event.X + CLOCK_FROM_MOUSE_X;
        }
        else
        {
            ymouse = evnt.clientY + CLOCK_FROM_MOUSE_Y;
            xmouse = evnt.clientX + CLOCK_FROM_MOUSE_X;
        }
      };
      document.onmousemove = null;
      requestAnimationFrame(ClockAndAssign);
    
```

そして、もう１箇所です。

```

    var vis=true;
      function toggle(){
        vis=!vis;
        document.getElementById("tog").value=vis?"STALK":"breakOFF";
          if(vis){
                ymouse = 180,
                xmouse = 520;
              document.onousemove=Mouse;
        }
          else{
               document.onmousemove=null;
        }
    }
    
```
CC BY-SA 4.0
2018-05-17T15:18:30.230
44048
2018-05-25T09:20:31.013
2018-05-18T13:37:03.997
19110
28531
question
javascript
トグルボタンで、"マウスストーカー"とマウスポイントを追従，もしくは分離させるコードの書き方
何十回も同じようなことを書いていたのですが、やっとうまく行きました。  
なぜ同じことを書いていたのに、うまく行かなかったのか、その原因が分かりません。  
スクリプト内の"function Mouse(evnt){}"と"function follow(){}"が関連箇所です。

```

    <!DOCTYPE html>
    <html>
    <head>
        <style>
            body {
      font-family: Helvetica, Arial, sans-serif;
    }
    
    .Face {
      position: absolute;
      height: 10;
      widdth: 10;
      text-align: center;
      font-size: 1em;
      color: #0000ff;
    }
    
    .Hours {
      position: absolute;
      width: 16px;
      height: 16px;
      font-family: Arial;
      font-size: 16px;
      color: #000000;
      text-align: center;
      font-weight: bold;
    }
    
    .Minutes {
      position: absolute;
      width: 16px;
      height: 16px;
      font-family: Arial;
      font-size: 16px;
      color: #000000;
      text-align: center;
      font-weight: bold;
    }
    
    .Seconds {
      position: absolute;
      width: 16px;
      height: 16px;
      font-family: Arial;
      font-size: 16px;
      color: #ff0000;
      text-align: center;
      font-weight: bold;
    }
    
    .Date {
      position: absolute;
      height: 10;
      width: 10;
      font-size: 1em;
      color: #00ff00;
    }
        </style>
    
        </head>
    
    <body>
        <div id="clock">
        <div id="Od" style="position:absolute;top:0px;left:0px">
            <div style="position:relative">
            </div>
        </div>
        <div id="Of" style="position:absolute;top:0px;left:0px">
            <div style="position:relative">
            </div>
        </div>
        <div id="Oh" style="position:absolute;top:0px;left:0px">
            <div style="position:relative">
            </div>
        </div>
        <div id="Om" style="position:absolute;top:0px;left:0px">
            <div style="position:relative">
            </div>
        </div>
        <div id="Os" style="position:absolute;top:0px;left:0px">
            <div style="position:relative">
            </div>
        </div>
    </div>
    
    <div style="position:absolute; bottom:8%; width:100%; text-align:center;">
     <input id="tog" type="button" value="BREAK" onclick="follow();">
    </div>
    
        <script type="text/javascript">
            "use strict";
    
    function $(sel) {
      return document.getElementById(sel);
    }
    
    function $$(sel) {
      return document.getElementsByClassName(sel);
    }
    
    function setPosition(element, y, x) {
      element.style.top = y + 'px';
      element.style.left = x + 'px';
    }
    
    var CLOCK_HEIGHT = 40,
        CLOCK_WIDTH = 40,
        CLOCK_FROM_MOUSE_Y = -200,
        CLOCK_FROM_MOUSE_X = 0;
    
    var H = '...'.split('');
    var M = '....'.split('');
    var S = '.....'.split('');
    var SPEED = 0.6,
        FACES = '1 2 3 4 5 6 7 8 9 10 11 12'.split(' ');
    var HAND_HEIGHT = CLOCK_HEIGHT / 4.5; 
    var HAND_WIDTH = CLOCK_WIDTH / 4.5;
    var HAND_Y = -7,
        HAND_X = -2.5,
        STEP = 0.03;
    
    var ymouse = 0,
        xmouse = 180;
    var currStep = 520;
    var lastBasePositions = [];
    
    function initialize() {
      for (var i = 0; i < FACES.length; ++i) {
        lastBasePositions[i] = {x:0, y:0};
      }
    
      var html = '';
      // Face wrapper
      html = '';
      for (var i = 0; i < FACES.length; ++i) {
        html += '<div class="Face">' + FACES[i] + '</div>';
      }
      $('Of').children[0].innerHTML = html;
    
      // Hours wrapper
      html = '';
      for (var i = 0; i < H.length; ++i) {
        html += '<div class="Hours">' + H[i] + '</div>';
      } 
      $('Oh').children[0].innerHTML = html;
    
      // Minute wrapper
      html = '';
      for (var i = 0; i < M.length; ++i) {
        html += '<div class="Minutes">' + M[i] + '</div>';
      }
      $('Om').children[0].innerHTML = html;
    
      // Seconds wrapper
      html = '';
      for (var i = 0; i < S.length; ++i) {
        html += '<div class="Seconds">' + S[i] + '</div>';
      }
      $('Os').children[0].innerHTML = html;
    
    // Mouse move event handler
    function Mouse(evnt) 
    {
            ymouse = evnt.clientY + CLOCK_FROM_MOUSE_Y;
            xmouse = evnt.clientX + CLOCK_FROM_MOUSE_X;
    }
      document.onmousemove = Mouse;
      requestAnimationFrame(ClockAndAssign);
    
    var flg=true;
    function follow(){ 
       flg = !flg; 
    document.getElementById("tog").value=flg?"BREAK":"FOLLOW";
    document.onmousemove = flg?Mouse:null;
    }
    document.getElementById("tog").onclick=follow;
    }
    
    
    var lastYearPositions = [{x:0, y:0}];
    var lastYearString = ' ';
    var lastYearMonthDateDay = '';
    function updateYear(currentDate, scrll) {
      var yearString = lastYearString;
      if (currentDate.getHours() < 21) {
        if (lastYearMonthDateDay != 'wa1')
          yearString = currentDate.toLocaleDateString("ja-JP-u-ca-japanese", { era: "long", year: "numeric", month: "numeric", day: "numeric", weekday: "long"  }).
              replace(/\u200e/g, "").replace(" ", "");
        lastYearMonthDateDay = 'wa1';
      } else {
        if (lastYearMonthDateDay != 'wa2')
          yearString = currentDate.toLocaleDateString("ja-JP-u-ca-japanese", { era: "long", year: "numeric", month: "numeric", day: "numeric", weekday: "long"  }).
              replace(/\u200e/g, "").replace(" ", "");
        lastYearMonthDateDay = 'wa2';
      }
    
      var yearLength = lastYearPositions.length;
      if (yearString != lastYearString) {
        lastYearString = yearString;        
        var yearCharacters = yearString.split('');
        yearLength = yearCharacters.length;
    
        // Date wrapper
        var html = '';
        for (var i = 0; i < yearLength; ++i) {
          html += '<div class="Date">' + yearCharacters[i] + '</div>';
        }
        $('Od').children[0].innerHTML = html;
      }
      var positions = [{}];
      var lastPosition = lastYearPositions[0];
      positions[0].y = lastPosition.y + ((ymouse) - lastPosition.y) * SPEED;
      positions[0].x = lastPosition.x + ((xmouse) - lastPosition.x) * SPEED;
      for (var i = 1; i < yearLength; ++i) {
        lastPosition = i < lastYearPositions.length ?
            lastYearPositions[i] :
            lastYearPositions[lastYearPositions.length - 1];
        positions[i] = {};
        positions[i].y = lastPosition.y + (positions[i-1].y - lastPosition.y) * SPEED;
        positions[i].x = lastPosition.x + (positions[i-1].x - lastPosition.x) * SPEED;
      }
      for (var i = 0; i < yearLength; ++i) {
        var radian = currStep + i * (360 / yearLength) * Math.PI / 180;
        setPosition($$('Date')[i],
                    Math.round(positions[i].y) + CLOCK_HEIGHT * 1.5 * Math.sin(radian) + scrll,
                    Math.round(positions[i].x) + CLOCK_WIDTH * 1.5 * Math.cos(radian));
      }
      lastYearPositions = positions;
      currStep -= STEP;
    }
    
    function ClockAndAssign() {
      var date = new Date();
      var secs = date.getSeconds();
      var sec = -1.57 + Math.PI * secs / 30;
      var mins = date.getMinutes();
      var min = -1.57 + Math.PI * mins / 30;
      var hr = date.getHours();
      var hrs = -1.575 + Math.PI * hr / 6 + Math.PI * parseInt(date.getMinutes(), 10) / 360;
      $('Od').style.top = window.document.body.scrollTop;
      $('Of').style.top = window.document.body.scrollTop;
      $('Oh').style.top = window.document.body.scrollTop;
      $('Om').style.top = window.document.body.scrollTop;
      $('Os').style.top = window.document.body.scrollTop;
      var scrll = 0;
    
      var positions = [{}];
      var lastPosition = lastBasePositions[0];
      positions[0].y = (lastPosition.y + (ymouse - lastPosition.y) * SPEED);
      positions[0].x = (lastPosition.x + (xmouse - lastPosition.x) * SPEED);
      for (var i = 1; i < FACES.length; ++i) {
        lastPosition = lastBasePositions[i];
        positions[i] = {};
        positions[i].y = (lastPosition.y + (positions[i - 1].y - lastPosition.y) * SPEED);
        positions[i].x = (lastPosition.x + (positions[i - 1].x - lastPosition.x) * SPEED);
      }
      lastBasePositions = positions;
    
      var split = 360 / FACES.length;
      for (var i = 0; i < FACES.length; ++i) {
        var radian = -1.0471 + i * split * Math.PI / 180;
        setPosition($$('Face')[i],
                    positions[i].y + CLOCK_HEIGHT * Math.sin(radian) + scrll,
                    positions[i].x + CLOCK_WIDTH * Math.cos(radian));
      }
      for (var i = 0; i < H.length; ++i) {
        setPosition($$('Hours')[i],
                    positions[i].y + HAND_Y + (i * HAND_HEIGHT) * Math.sin(hrs) + scrll,
                    positions[i].x + HAND_X + (i * HAND_WIDTH) * Math.cos(hrs));
      }
      for (var i = 0; i < M.length; ++i) {
        setPosition($$('Minutes')[i],
                    positions[i].y + HAND_Y + (i * HAND_HEIGHT) * Math.sin(min) + scrll,
                    positions[i].x + HAND_X + (i * HAND_WIDTH) * Math.cos(min));
      }
      for (var i = 0; i < S.length; ++i) {
        setPosition($$('Seconds')[i],
                    positions[i].y + HAND_Y + (i * HAND_HEIGHT) * Math.sin(sec) + scrll,
                    positions[i].x + HAND_X + (i * HAND_WIDTH) * Math.cos(sec));
      }
      updateYear(date, scrll);
      requestAnimationFrame(ClockAndAssign);
    }
    
    initialize();
        </script>
    </body>
    </html>
    
```
CC BY-SA 4.0
2018-05-25T09:20:31.013
44259
2018-05-25T09:20:31.013
28531
44048
answer