如何在表格单元格中创建对角线？

Question

如何创建从任何给定单元格的左下角到右上角的对角线？

为了得到这个

<table>
    <tr>
        <td class="crossOut">A1</td>
        <td>B1</td>
    </tr>
    <tr>
        <td>A2 Wide</td>
        <td class="crossOut">B2<br/>Very<br/>Tall</td>
    </tr>
</table>

to show this

Answer 1

我不知道这是否是最好的方法，但是我无法使用CSS做到这一点。我的答案是在jQuery中：

$(function(){
    $('.crossOut').each(function(i){
        var jTemp = $(this),
            nWidth = jTemp.innerWidth(),
            nHeight = jTemp.innerHeight(),
            sDomTemp = '<div style="position:absolute; border-color: transparent black white white; border-style:solid; border-width:'+nHeight +'px '+nWidth +'px 0px 0px; width:0; height:0; margin-top:-'+nHeight+'px; z-index:-2"></div>';

        sDomTemp += '<div style="position:absolute; border-color: transparent white white white; border-style:solid; border-width:'+nHeight +'px '+nWidth +'px 0px 0px; width:0; height:0; margin-top:-'+(nHeight-1)+'px; z-index:-1"></div>';

        jTemp.append(sDomTemp);
    });
});

or

CSS part:

.crossOut .child{
    position:absolute; 
    width:0; 
    height:0;
    border-style:solid;
}
.crossOut .black-triangle{
    z-index:-2;
    border-color: transparent black white white;
}
.crossOut .white-triangle{
    border-color: transparent white white white;
    z-index:-1;
}

jQuery code:

$(function(){
    $('.crossOut').each(function(i){
        var jTemp = $(this),
            nWidth = jTemp.innerWidth(),
            nHeight = jTemp.innerHeight(),
            sDomTemp = '<div class="child black-triangle" style="border-width:'+nHeight +'px '+nWidth +'px 0px 0px; margin-top:-'+nHeight+'px; "></div>';

        sDomTemp += '<div class="child white-triangle" style="border-width:'+nHeight +'px '+nWidth +'px 0px 0px; margin-top:-'+(nHeight-1)+'px;"></div>';

        jTemp.append(sDomTemp);
    });
});

好处是它可以与表格单元的任何宽度和高度一起使用。