d3.js在svg中包含的所有路径上的foreach循环

Question

我有像这样的d3.js生成的svg:

<svg height="1094" width="1254">
    <g id="countries" stroke-width="1px" transform="">
        <path d="M100,519.150,200,250" fill="rgba(100,100,100,0.8)"
        stroke="rgba(200,200,200,0.5)" id="id1" class="1"></path>
        <path d="M100,519.150,200,250" fill="rgba(100,100,100,0.8)"
        stroke="rgba(200,200,200,0.5)" id="id2" class="1"></path>
        <path d="M100,519.150,200,250" fill="rgba(100,100,100,0.8)"
        stroke="rgba(200,200,200,0.5)" id="id3" class="3"></path>
        <path d="M100,519.150,200,250" fill="rgba(100,100,100,0.8)"
        stroke="rgba(200,200,200,0.5)" id="id4" class="1"></path>
    </g>
</svg>

我想做那样的somtehing:

foreach(path in #countries){
    if(this.class === 3){dostuff}
}

我尝试过jquery方式:

$('#countries').find('path').each(function( index ) {
    console.log(this);
});

......什么都不记录

我尝试过d3.js方式(各国初始化如下:)countries = svg.append('svg:g').attr('id', 'countries'):

countries.select('path').each(console.log(this));
countries.selectAll('path').each(console.log(this));

记录窗口对象(wtf？)

Answer 1

方法selection.each需要一个函数作为参数:

countries.selectAll('path').each(function(d,i) { console.log(this); });