


When we register a website, we will see the three-level linkage between provinces and municipalities. Here is a brief introduction
<!doctype html> <html lang="en"> <head> <meta charset="UTF-8"> <meta name="Generator" content="EditPlus®"> <meta name="Author" content=""> <meta name="Keywords" content=""> <meta name="Description" content=""> <title>Document</title> </head> <body> <select id="province" onChange="ck()" > <option>--请选择--</option> </select> <select id="city"> <option>--请选择--</option> </select> <select id="san"> <option>--请选择--</option> </select> </body> <script type="text/javascript"> //======================================第一种方法:获取省市二级联菜单============================= //获取省的id var prame= document.getElementById("province"); var city= document.getElementById("city"); var san= document.getElementById("san"); //创建省市数组 var cityList=new Array(); //创建另一个数组 var zushu=new Array; cityList['江西省'] = ['南昌市','抚州市','上饶市','鹰潭市','丰城市','吉安市']; cityList['河南省'] = ['郑州市','洛阳市']; cityList['湖北省'] = ['武汉市','宜昌市']; cityList['福建省'] = ['福州市','三明市','佛山市']; zushu['南昌市']=['南昌县','青云谱区','莲塘镇']; zushu['抚州市']=['临川区','云山镇','唱凯镇']; for(var i in cityList){ prame.add(new Option(i,i),null); } prame.onchange=function(){ var prame= document.getElementById("province").value; var city= document.getElementById("city"); city.options.length=0; for(var k in cityList[prame]){ city.add(new Option(cityList[prame][k],cityList[prame][k]),null); } } city.onchange=function(){ var city= document.getElementById("city").value; var san= document.getElementById("san"); san.options.length=0; for(var k in zushu[city]){ san.add(new Option(zushu[city][k]),(zushu[city][k]),null); } } </script> <!--------------------------------第二种方法:三级联动菜单---------------------- <script type="text/javascript"> //获取省的id var province=document.getElementById("province"); province.add(new Option("江西省","江西省"),null); province.add(new Option("福建省","福建省"),null); province.add(new Option("广东省","广东省"),null); function ck(){ var city=document.getElementById("city"); var num=province.selectedIndex; city.options.length=0; switch(num){ case 1: city.add(new Option("南昌市","南昌市"),null); city.add(new Option("抚州市","抚州市"),null); city.add(new Option("上饶市","上饶市"),null); city.add(new Option("吉安市","吉安市"),null); break; case 2: city.add(new Option("厦门市","厦门市"),null); city.add(new Option("三明市","三明市"),null); city.add(new Option("莆田市","莆田市"),null); city.add(new Option("龙岩市","龙岩市"),null); break; case 3: city.add(new Option("广州市","广州市"),null); city.add(new Option("东莞市","东莞市"),null); city.add(new Option("保定市","保定市"),null); city.add(new Option("珠海市","珠海市"),null); break; } var qu=document.getElementById("qu"); var num1=province.selectedIndex; qu.options.length=0; switch(num1){ case 1: qu.add(new Option("临川区","临川区"),null); qu.add(new Option("青云谱区","青云谱区"),null); qu.add(new Option("南昌镇","南昌镇"),null); qu.add(new Option("云山镇","云山镇"),null); break; case 2: qu.add(new Option("保安县","保安县"),null); qu.add(new Option("福田区","福田区"),null); qu.add(new Option("将乐县","将乐县"),null); qu.add(new Option("厦门区","厦门区"),null); break; case 3: qu.add(new Option("广上县","光上县"),null); qu.add(new Option("西莞区","西莞区"),null); qu.add(new Option("三海县","三海县"),null); qu.add(new Option("广岛区","广岛区"),null); break; } } </script>--> </html>
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去掉重复并排序的方法:1、使用“Array.from(new Set(arr))”或者“[…new Set(arr)]”语句,去掉数组中的重复元素,返回去重后的新数组;2、利用sort()对去重数组进行排序,语法“去重数组.sort()”。

本篇文章给大家带来了关于JavaScript的相关知识,其中主要介绍了关于Symbol类型、隐藏属性及全局注册表的相关问题,包括了Symbol类型的描述、Symbol不会隐式转字符串等问题,下面一起来看一下,希望对大家有帮助。

怎么制作文字轮播与图片轮播?大家第一想到的是不是利用js,其实利用纯CSS也能实现文字轮播与图片轮播,下面来看看实现方法,希望对大家有所帮助!

本篇文章给大家带来了关于JavaScript的相关知识,其中主要介绍了关于对象的构造函数和new操作符,构造函数是所有对象的成员方法中,最早被调用的那个,下面一起来看一下吧,希望对大家有帮助。

本篇文章给大家带来了关于JavaScript的相关知识,其中主要介绍了关于面向对象的相关问题,包括了属性描述符、数据描述符、存取描述符等等内容,下面一起来看一下,希望对大家有帮助。

方法:1、利用“点击元素对象.unbind("click");”方法,该方法可以移除被选元素的事件处理程序;2、利用“点击元素对象.off("click");”方法,该方法可以移除通过on()方法添加的事件处理程序。

本篇文章给大家带来了关于JavaScript的相关知识,其中主要介绍了关于BOM操作的相关问题,包括了window对象的常见事件、JavaScript执行机制等等相关内容,下面一起来看一下,希望对大家有帮助。

foreach不是es6的方法。foreach是es3中一个遍历数组的方法,可以调用数组的每个元素,并将元素传给回调函数进行处理,语法“array.forEach(function(当前元素,索引,数组){...})”;该方法不处理空数组。


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mPDF is a PHP library that can generate PDF files from UTF-8 encoded HTML. The original author, Ian Back, wrote mPDF to output PDF files "on the fly" from his website and handle different languages. It is slower than original scripts like HTML2FPDF and produces larger files when using Unicode fonts, but supports CSS styles etc. and has a lot of enhancements. Supports almost all languages, including RTL (Arabic and Hebrew) and CJK (Chinese, Japanese and Korean). Supports nested block-level elements (such as P, DIV),
