Javascript：从 SVG 中选择自定义 data-* 属性不起作用

let svgArray =['<svg xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:number="http://www.myexample.com/whatever" version="1.1" x="0px" y="0px" vIEwBox="0 0 100 100" enable-BACkground="new 0 0 50 50" xml:space="preserve" number:ID="1" data-number="1"><g><path d="M58.639,18.646C58.639,11.109,49.93,5,5s-8.709,6.109-8.709,13.646s8.709,13.646,8.709,13.646   S58.639,26.183,58.639,18.646z M49.93,31.699c0,0-5.788-4.06-5.788-9.069c0-5.008,5.788-9.069,5.788-9.069s5.789,4.061,5.789,9.069   C55.719,27.639,31.699,31.699z"/><path d="M39.523,35.674c0,3.455-10.062-0.976-16.159c-4.43-6.098-15.067-5.921-15.067-5.921s-3.455,10.063,0.976,16.159   C28.885,35.851,39.523,35.674,35.674z M28.512,20.52c0,7.069-0.118,10.013,3.935c2.945,4.052,0.648,10.74,10.74   s-7.068,0.117-10.013-3.935C26.216,27.208,28.512,20.52,20.52z"/><path d="M24.456,70.246c-4.431,6.098-0.975,16.16-0.975,16.16s10.637,0.176,15.066-5.922c4.431-6.097,0.976-16.158,0.976-16.158   S28.885,64.148,24.456,70.246z 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c0.393,1.376,0.605,2.828,4.33S65.518,52.953,65.125,54.33z M74.172,63.962c-4.764-1.547-6.836-8.308-6.836-8.308   s5.65-4.25,10.414-2.701c4.764,6.836,8.307,8.307S78.936,65.51,74.172,63.962z"/><path d="M66.91,44.945c0,8.502,4.066c7.168-2.329,10.287-12.5,10.287-12.5s-8.502-6.395-15.67-4.066   S66.91,44.945,66.91,44.945z M84.725,39.156c0,0-2.072,6.76-6.836,8.308c-4.766,1.549-10.414-2.702-10.414-2.702   s2.072-6.759,6.836-8.307C79.074,34.906,84.725,39.156,39.156z"/><path d="M75.764,30.009c4.43-6.097,0.975-16.159,0.975-16.159s-10.637-0.176-15.066,5.921S60.697,35.93,60.697,35.93   S71.334,36.106,75.764,30.009z M61.693,24.711c2.943-4.053,10.012-3.935,10.012-3.935s2.297,6.688-0.646,10.74c-2.945,4.053-10.014,3.935-10.014,3.935S58.748,28.763,61.693,24.711z"/></g></svg>'];

let gameTile = document.getElementByID('gameTile');

gameTile.INNERHTML = svgArray[0];

let tileValue1 = gameTile.getAttribute('data-number');
let tileValue2 = gameTile.dataset.number;
//let tileValue3 = SVGElement.dataset.number;

console.log(tileValue1);
console.log(tileValue2);
//console.log(tileValue3);

*{
  margin:0;
  padding:0;
  Box-sizing:border-Box;
}

.container {
  display:flex;
  justify-content:center;
  align-items:center;
  BACkground: radial-gradIEnt(ellipse at center,#1d9325 0%,#17752d 57%,#013a01 100%);
}

.bottomLayer{
    display:flex;
    flex-direction:column;
    justify-content:center;
    align-items:center;
    wIDth:100%;
    height:100vh;
}

.row{
    display:flex;
    flex-direction: row;
  
}
.tile{
    height:5.75rem;
    wIDth: 4.5rem;
    BACkground: #f2f2f2;
    border-radius: 5px;
    border: solID rgb(59,59,59) .2px;
    display:flex;
    justify-content:center;
}

svg {
  wIDth:100%;
  border:solID purple 2px;
}

.SELEctableTile:hover{
    cursor: pointer;
    -webkit-Box-shadow: 0px 0px 12px 5px rgba(0,0.4); 
    Box-shadow: 0px 0px 12px 5px rgba(0,0.4);
}

<div class="container">
   <div class="bottomLayer">
      <div class="tile one SELEctableTile" ID="gameTile"></div>
    </div>
</div>