鼠标悬停控件上有提示

function GetValueForToolTip(obj) {
var tValue = obj.innerText;
    obj.setAttribute("title", tValue);
}

 

<td width="25%" onmouseover='GetValueForToolTip(this)'>HaHa</td>

 

<button id="hahaBtn" onmouseover="'GetValueForToolTip(this);">HaHa Button</button>