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input 輸入欄位只能輸入數字0-9

做法１：
onKeyUp="value=value.replace(/[^0123456789]/g,'')"

做法２：
onkeypress="return Fun_InputNum(event);"

function Fun_InputNum(e){
  var key = window.event ? e.keyCode : e.which;
  var keychar = String.fromCharCode(key);
  reg = /d/;
  return reg.test(keychar);
}