JohnieLi的博客

ajax传递参数：function select_img(index) { $("#demo-origin-idcard").html("<br /><img src='/static/demo-card-"+index+".png'>"); $.ajax({ url:'/idcard_ocr_by_name', ...

一、js获取select标签选中的值var obj = document.getElementById(”testSelect”); //定位idvar index = obj.selectedIndex; // 选中索引var text = obj.options[index].text; // 选中文本var value = obj.options[index].val...

js 判断数据是否为空// var a = "";// var a = " ";// var a = null;// var a = undefined;// var a = [];// var a = {};// var a = NaN; if(a === undefined) { // 只能用 === 运算来测试某个值是...