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‘\\’