JS速查

速查"/>

JS速查

select

//根据值让option选中 $("#refundReason option[value='"+key+"']").attr("selected","selected");

js截取字符串

var  leftItems= "1,2,3,4,5,6";
var resultLeft=leftItems.split("，");

js变量非空判断

//    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否是未定义的console.log("为undefined");}if(a == null) { // 等同于 a === undefined || a === nullconsole.log("为null");}// String    if(a == "" || a == null || a == undefined){ // "",null,undefinedconsole.log("为空");}if(!a){ // "",null,undefined,NaNconsole.log("为空"); }if(!$.trim(a)){ // "",null,undefinedconsole.log("为空");}// Arrayif(a.length == 0){ // "",[]console.log("为空");}if(!a.length){ // "",[]console.log("为空");}// Object {}if($.isEmptyObject(a)){ // 普通对象使用 for...in 判断，有 key 即为 falseconsole.log("为空");}