Change class of element using javascript

This question already has an answer here:

Change an element's class with JavaScript 30 answers

Add class to element 4 answers

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You have to wrap X in a <td> :

http://jsfiddle.net/DerekL/CVxP7/

<tr>...<td id="x" class="show">x</td></tr>

Also you have to add case in front of "a":

case "a":
    document.getElementById("x").setAttribute("class", "show");
    break;

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PS: There is a more efficient way to achieve what you are trying to do here:

http://jsfiddle.net/DerekL/CVxP7/2/

function wow(value) {
    var index = {
        a: "show",
        b: "hide"
    };
    document.getElementById("x").setAttribute("class", index[value]);
}

Now you don't need to type document.getElementById("x").setAttribute("class"... twice.

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尝试这个

switch(value){
    case "a": document.getElementById("x").setAttribute("class", show); break;        
    case "b": document.getElementById("x").setAttribute("class", hide); break;
}

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