


js simply implements HTML tag Select linkage with jump_javascript skills
JScript1 code:
var groups = document.form5.domain.options.length
var group = new Array(groups)
for (i = 0; i group[i] = new Array()
//江岸
group[1][0] = new Option('不限', '0');
group[1][1] = new Option('堤角谌家矶', '17');
group[1][2] = new Option('二七', '18');
group[1][3] = new Option('后湖', '19');
group[1][4] = new Option('蔡家田花桥', '20');
group[1][5] = new Option('永清黄浦', '21');
group[1][6] = new Option('三阳路', '22');
group[1][7] = new Option('台北路香港路', '23');
group[1][8] = new Option('江汉路大智路', '24');
group[1][9] = new Option('其他', '25');
//江汉
group[2][0] = new Option('不限', '0');
group[2][1] = new Option('杨汊湖', '26');
group[2][2] = new Option('复兴村常青', '27');
group[2][3] = new Option('唐家墩', '28');
group[2][4] = new Option('王家墩CBD', '29');
group[2][5] = new Option('西北湖', '30');
group[2][6] = new Option('武广万松园', '31');
group[2][7] = new Option('前进花楼', '32');
group[2][8] = new Option('其他', '33');
//桥口
group[3][0] = new Option('不限', '0');
group[3][1] = new Option('武胜路', '34');
group[3][2] = new Option('宝丰', '35');
group[3][3] = new Option('宗关', '36');
group[3][4] = new Option('汉西', '37');
group[3][5] = new Option('古田', '38');
group[3][6] = new Option('其他', '39');
//东西湖
group[4][0] = new Option('不限', '0');
group[4][1] = new Option('常青花园', '40');
group[4][2] = new Option('金银湖', '41');
group[4][3] = new Option('吴家山', '42');
group[4][4] = new Option('金银潭将军路', '43');
group[4][5] = new Option('其他', '44');
//汉阳
group[5][0] = new Option('不限', '0');
group[5][1] = new Option('鹦鹉大道钟家村', '52');
group[5][2] = new Option('王家湾七里庙', '53');
group[5][3] = new Option('四新', '54');
group[5][4] = new Option('黄金口琴断口', '55');
group[5][5] = new Option('其他', '56');
//武汉经开
group[6][0] = new Option('不限', '0');
group[6][1] = new Option('沌口片', '57');
group[6][2] = new Option('其他', '58');
//武昌
group[7][0] = new Option('不限', '0');
group[7][1] = new Option('徐东', '62');
group[7][2] = new Option('岳家嘴', '63');
group[7][3] = new Option('水果湖', '64');
group[7][4] = new Option('积玉桥', '65');
group[7][5] = new Option('中南丁字桥', '66');
group[7][6] = new Option('小东门', '67');
group[7][7] = new Option('司门口', '68');
group[7][8] = new Option('阅马场首义', '69');
group[7][9] = new Option('武泰闸', '70');
group[7][10] = new Option('南湖花园', '71');
group[7][11] = new Option('其他', '72');
//青山
group[8][0] = new Option('不限', '0');
group[8][1] = new Option('建二', '73');
group[8][2] = new Option('红钢城', '74');
group[8][3] = new Option('其他', '75');
//洪山
group[9][0] = new Option('不限', '0');
group[9][1] = new Option('珞狮街道口', '76');
group[9][2] = new Option('卓刀泉虎泉', '77');
group[9][3] = new Option('南湖', '78');
group[9][4] = new Option('白沙洲', '79');
group[9][5] = new Option('黄家湖', '80');
group[9][6] = new Option('杨春湖', '81');
group[9][7] = new Option('其他', '82');
//东湖高新
group[10][0] = new Option('不限', '0');
group[10][1] = new Option('鲁巷', '88');
group[10][2] = new Option('关山', '89');
group[10][3] = new Option('大学科技园', '90');
group[10][4] = new Option('藏龙岛', '91');
group[10][5] = new Option('花山', '92');
group[10][6] = new Option('其他', '93');
//江夏
group[11][0] = new Option('不限', '0');
group[11][1] = new Option('流芳', '83');
group[11][2] = new Option('纸坊', '84');
group[11][3] = new Option('庙山', '85');
group[11][4] = new Option('大桥', '86');
group[11][5] = new Option('其他', '87');
//黄陂
group[12][0] = new Option('不限', '0');
group[12][1] = new Option('前川', '45');
group[12][2] = new Option('盘龙城', '46');
group[12][3] = new Option('武湖', '47');
group[12][4] = new Option('其他', '48');
//新洲
group[13][0] = new Option('不限', '0');
group[13][1] = new Option('新洲城区', '49');
group[13][2] = new Option('阳逻', '50');
group[13][3] = new Option('其他', '51');
//蔡甸
group[14][0] = new Option('不限', '0');
group[14][1] = new Option('蔡甸', '59');
group[14][2] = new Option('其他', '60');
//汉南
group[15][0] = new Option('汉南', '61');
//其他
group[16][0] = new Option('其他区域', '94');
var temp = document.form5.pian
function redirect2(x) {
for (m = temp.options.length - 1; m > 0; m--)
temp.options[m] = null
for (i = 0; i temp.options[i] = new Option(group[x][i].text, group[x][i].value)
}
temp.options[0].selected = true
}
var bDomainId = 0;
var sDomainId = 0;
function getTabUrl(shangpu) {
bDomainId = $("#domainNewHouse").val();
sDomainId = $("#pianqu").val();
window.open("http://***.com.cn/houselist_" bDomainId "_" sDomainId "_0_0_0_0_0_0__2_2_1.html");
}

The main uses of JavaScript in web development include client interaction, form verification and asynchronous communication. 1) Dynamic content update and user interaction through DOM operations; 2) Client verification is carried out before the user submits data to improve the user experience; 3) Refreshless communication with the server is achieved through AJAX technology.

Understanding how JavaScript engine works internally is important to developers because it helps write more efficient code and understand performance bottlenecks and optimization strategies. 1) The engine's workflow includes three stages: parsing, compiling and execution; 2) During the execution process, the engine will perform dynamic optimization, such as inline cache and hidden classes; 3) Best practices include avoiding global variables, optimizing loops, using const and lets, and avoiding excessive use of closures.

Python is more suitable for beginners, with a smooth learning curve and concise syntax; JavaScript is suitable for front-end development, with a steep learning curve and flexible syntax. 1. Python syntax is intuitive and suitable for data science and back-end development. 2. JavaScript is flexible and widely used in front-end and server-side programming.

Python and JavaScript have their own advantages and disadvantages in terms of community, libraries and resources. 1) The Python community is friendly and suitable for beginners, but the front-end development resources are not as rich as JavaScript. 2) Python is powerful in data science and machine learning libraries, while JavaScript is better in front-end development libraries and frameworks. 3) Both have rich learning resources, but Python is suitable for starting with official documents, while JavaScript is better with MDNWebDocs. The choice should be based on project needs and personal interests.

The shift from C/C to JavaScript requires adapting to dynamic typing, garbage collection and asynchronous programming. 1) C/C is a statically typed language that requires manual memory management, while JavaScript is dynamically typed and garbage collection is automatically processed. 2) C/C needs to be compiled into machine code, while JavaScript is an interpreted language. 3) JavaScript introduces concepts such as closures, prototype chains and Promise, which enhances flexibility and asynchronous programming capabilities.

Different JavaScript engines have different effects when parsing and executing JavaScript code, because the implementation principles and optimization strategies of each engine differ. 1. Lexical analysis: convert source code into lexical unit. 2. Grammar analysis: Generate an abstract syntax tree. 3. Optimization and compilation: Generate machine code through the JIT compiler. 4. Execute: Run the machine code. V8 engine optimizes through instant compilation and hidden class, SpiderMonkey uses a type inference system, resulting in different performance performance on the same code.

JavaScript's applications in the real world include server-side programming, mobile application development and Internet of Things control: 1. Server-side programming is realized through Node.js, suitable for high concurrent request processing. 2. Mobile application development is carried out through ReactNative and supports cross-platform deployment. 3. Used for IoT device control through Johnny-Five library, suitable for hardware interaction.

I built a functional multi-tenant SaaS application (an EdTech app) with your everyday tech tool and you can do the same. First, what’s a multi-tenant SaaS application? Multi-tenant SaaS applications let you serve multiple customers from a sing


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