javascript字符串单引号与双引号的区别

最近在使用javascript编程,遇到使用字符串的情况

写了一点测试代码

        var str = 'This is Jack';
        var str2 = "This is Tom";
        var str3 = 'This is "Rose"';
        var str4 = "This is 'LiLi'";
        var str5 = "This is \"Sun\"";
        var str6 = 'This is \'Mary\'';
        var str7 = "This is \'Lucy\'";
        var str8 = 'This is \"Rooney\"';
        var str9 = 'This is \\Ronaldo\\';

        console.log(str);
        console.log(str2);
        console.log(str3);
        console.log(str4);
        console.log(str5);
        console.log(str6);
        console.log(str7);
        console.log(str8);
        console.log(str9);

测试结果：

This is Jack
 This is Tom
This is "Rose"
 This is 'LiLi'
 This is "Sun"
 This is 'Mary'
This is 'Lucy'
This is "Rooney"
This is \Ronaldo\

结论：（1）只使用字符的字符串，单引号和双引号没有区别

    （2）在单引号包括的字符串中可以直接用双引号，在双引号包括的字符串中可以直接用单引号

           （3）如果在双引号包括的字符串中用双引号，需要用反斜杠转义，注意是"\"   ;同样在单引号包括的字符串中用单引号，也需要转义

   （4）如果要用反斜杠，则输入‘\\’