<input type="button" value="私はボタンです" id="btn" onclick="zibun(this.value)">
<input type="button" value="青色" id="btn_color" onclick="colorChange(this)">
function zibun(value){
  alert(value)
}

function colorChange(object){
    if(object.value =="青色"){
      object.value = "赤色"
      object.style.color = "red"
    }else{
       object.value = "青色"
       object.style.color = "blue"
    }
}

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External JavaScript

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