二手交易网站设计怎么做怎样推荐企业建设网站和互联网推广

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项目地址

• 教程作者：PINK
• 教程地址：

V6.5

• 代码仓库地址：

• 所用到的框架和插件：

JAVASCRIPT

一、JS

1.1 if语句

• 和c#一样

int number = 10;if (number > 0 && number < 10)
{Console.WriteLine("The number is between 0 and 10.");
}
else if (number >= 10 && number < 20)
{Console.WriteLine("The number is between 10 and 20.");
}
else
{Console.WriteLine("The number is 20 or greater.");
}

1.2 for循环

和C#一毛一样

for (初始化; 条件; 迭代)
{// 循环体代码
}

• 注意他们分号隔开

        var num =[];num = ['red','green','blue','yellow','black','white','pink','purple','orange','brown'];for (var i =0 ;i<num.length;i++){console.log(num[i]);}

1.2 三元表达式

判断条件？真：假

        var num =10;num <5 ? alert("<5 ") : alert(">5")

1.3 switch

• C#相同语法：用operation 匹配case 后面的值

char operation = '+';
int a = 5, b = 3;switch (operation)
{case '+':Console.WriteLine($"Result: {a + b}");break;case '-':Console.WriteLine($"Result: {a - b}");break;case '*':Console.WriteLine($"Result: {a * b}");break;case '/':Console.WriteLine($"Result: {a / b}");break;default:Console.WriteLine("Invalid operation");break;
}

1.4 数组的push方法

• Js的array()对应的C#里的ArrayList()都是动态数组，可以放不同的类；
• 区别：js数组增加元素用push

    <script>var num =[];var kong =[];num = ['red','green','blue','yellow','black','white','pink','purple','orange','brown'];for (var i &