jquery源文件已经正确引入，用的1.11.3版本
<body>
<div id="shoppingCart">nums of goods in cart:<span>33</span></div>
<script>
var cart = $("#shoppingCart"),span = $("#shoppingCart>span");
console.log(cart.html());
console.log(cart.text());
console.log(span.html());
console.log(span.text());
</script>
</body>
输出结果为undefined {空字符串} undefined {空字符串}
不知道是哪里的问题，请各位不吝赐教
