FreeCodeCamp备查簿(5:#132-#160--JavaScript基础)
20170816
```
JavaScript的注释
//这是一个JavaScript的注释
/*这是一个JavaScript的
段落注释
*/
```
133、 Declare JavaScript Variables
```
创建JavaScript变量
var myName;
```
134、 Storing Values with the Equal Operator
```
给变量赋值
a = 7;
b = a;
```
135、 Initializing Variables with the Equal Operator
```
用var初始化变量值
var a = 9;
```
136、 Understanding Uninitialized Variables
```
修改a,b,c并分别赋值
var a = 5;
var b = 10;
var c ="I am a";
```
137 Understanding Case Sensitivity in Variables
```
驼峰命名法,这节培养程序员写代码的基础规范,养成良好的命名规范才能减少将来自己的麻烦.这一节建议大家仔细找找变量名的问题,不要拷贝粘贴
var studlyCapVar;
var properCamelCase;
var titleCaseOver;
// 给变量赋值
studlyCapVar = 10;
properCamelCase = "A String";
titleCaseOver = 9000;
```
138、 Add Two Numbers with JavaScript
```
JavaScript做加法
var sum = 10 + 10;
```
139、 Subtract One Number from Another with JavaScript
```
JavaScript减法
var difference = 45 - 33;
```
140、 Multiply Two Numbers with JavaScript
```
JavaScript乘法
var product = 8 * 10;
```
141、 Divide One Number by Another with JavaScript
```
JavaScript除法
var quotient = 66 / 33;
```
142、 Increment a Number with JavaScript
```
变量自增
myVar++;
```
143、 Decrement a Number with JavaScript
```
变量自减
var myVar = 11;
// 请只修改这条注释以下的代码
myVar--;
```
144、 Create Decimal Numbers with JavaScript
```
赋值浮点数
var myDecimal = 5.7;
```
145、 Multiply Two Decimals with JavaScript
```
两个小数相乘
var product = 2.0 * 2.5;
```
146、 Divide one Decimal by Another with JavaScript
```
小数除法
var quotient = 4.4 / 2.0;
```
147、 Finding a Remainder in JavaScript
```
取余
var remainder = 11%3;
```
150、 Assignment with Plus Equals
```
运用+=运算符
a += 12;
b += 9;
c += 7;
```
151、 Assignment with Minus Equals
```
运用-=运算符
a-=6;
b -= 15;
c -= 1;
```
152、 Assignment with Times Equals
```
运用*=运算符
a *= 5;
b *= 3;
c *= 10;
```
153、 Assignment with Divided by Equals
```
运用 /= 运算符
a /= 12;
b /= 4;
c /= 11;
```
154、 Convert Celsius to Fahrenheit
```
把摄氏度改成华氏度(我觉得我写的可能有问题,不过还是通过了)
function convert(celsius) {
// 请把你的代码写在这条注释以下
var fahrenheit = celsius * 9 / 5 + 32;
```
155、 Declare String Variables
```
字符串赋值
var myFirstName = "wang";
var myLastName = "cong";
```
156、 Escaping Literal Quotes in Strings
```
转义符号"\"
var myStr = "I am a \"double quoted\" string inside \"double quotes\"";
```
157、 Quoting Strings with Single Quotes
```
修改代码,去掉转义符号,将双引号改为单引号,也就是说单引号里面的字符串中,增加双引号是不用写转义字符的.
var myStr = 'Link'
```
158、 Escape Sequences in Strings
```
用转义符按顺序输入符号
var myStr="\\ \t \b \r \n"; // 请修改这一行
```
159、 Concatenating Strings with Plus Operator
```
+为连接符号(这里注意This is the start.后面有个空格)
var myStr = "This is the start. "+"This is the end.";
```
160、 Concatenating Strings with the Plus Equals Operator
```
用+=运算符连接字符串
var myStr = "This is the first sentence. ";
myStr += "This is the second sentence.";
```
