lovecoding
/
web0715


			
				
					
						
						
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							<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    <script>
        var num = 1;
        var num2 = 2;
        console.log(num + num2);//加
        console.log(num2 - num);//减
        console.log(num * num2);//乘
        console.log(num2 / num);//除

        // 如果对字符型进行加法运算 那么他将加号左右两边进行字符拼接
        var str1 = "hello";
        var str2 = "world";
        console.log(str1 + str2);
        // 加法运算如果一侧是字符型 那么统一按照字符串拼接实现
        var str3 = "你好";
        var str4 = 10;
        console.log(str3 + str4);
        // 如果 字符型数字参与 - * / 运算会转行成数字型运算
        var str5 = 1;
        var str6 = "2";
        console.log(str5 * str6);

        // 逻辑运算
        var num3 = 1;
        var num4 = 2;
        var num5 = 2;
        var num6 = "2";
        console.log(num4 > num3);//大于
        console.log(num4 < num3);//小于
        console.log(num4 == num5);//是否等于
        console.log(num4 >= num5);//大于等于
        console.log(num4 <= num5);//小于等于
        // 如果字符型数字和数值型数字进行 == 运算 会转行成数值型进行对比
        console.log(num6 == num5);
        console.log(num6 === num5);
    </script>
</body>
</html>