jQuery 杂项 size() 方法
示例
显示 jQuery 选择器匹配的元素数量
$("button").click(function(){
alert($("li").size());
});
定义和用法
size() 方法在 1.8 版本中已弃用，并在 jQuery 3.0 版本中移除。请改用 length 属性。
size() 方法返回 jQuery 选择器匹配的元素数量。
语法
$(selector).size()
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