jquery 判断两个对象是否相同

<a href="#" id="a">a</a>

<a href="#" id="b">b</a>

<script type="text/javascript">

$(function(){

$('#a').greenify();

});

</script>

$.fn.greenify = function() {

    console.log(this.index());

    console.log($("#b").index());

    this.css( "color", "green" );

};