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//定義"改變顏色"的函數(shù) function ChangeColor() { var ele = document.getElementById("txt"); ele.style.color = "red"; ele.style.backgroundColor = "black"; } //定義"改變寬高"的函數(shù) function ChangeSize() { var ele = document.getElementById("txt"); ele.style.width = "300px"; ele.style.height = "300