Web Notes
2015.09.26
HTML 相对路径和绝对路径区别分析
HTML 初学者会经常遇到这样一个问题，如何正确引用一个文件。比如，怎样在一个 HTML 网页中引用另外一个 HTML 网页作为超链接（hyperlink），怎样在一个网页中插入一张图片。如果你在引用文件时（如加入超链接，或者插入图片等），使用了错误的文件路径，就会导致引用失效（无法浏览链接文件，或无法显示插入的图片等）。
| Precedence | Operator | Type | Associativity |
|---|---|---|---|
| 15 | ()[]· | Parentheses Array subscript Member selection | Left to Right |
| 14 | ++-- | Unary post-increment Unary post-decrement | Right to left |
| 13 | ++--+-!~( type ) | Unary pre-increment Unary pre-decrement Unary plus Unary minus Unary logical negation Unary bitwise complement Unary type cast | Right to left |
| 12 | */% | Multiplication Division Modulus | Left to right |
| 11 | +- | Addition Subtraction | Left to right |
| 10 | <<>>>>> | Bitwise left shift Bitwise right shift with sign extension Bitwise right shift with zero extension | Left to right |
| 9 | <<=>>=instanceof | Relational less than Relational less than or equal Relational greater than Relational greater than or equal Type comparison (objects only) | Left to right |
| 8 | ==!= | Relational is equal to Relational is not equal to | Left to right |
| 7 | & | Bitwise AND | Left to right |
| 6 | ^ | Bitwise exclusive OR | Left to right |
| 5 | | | Bitwise inclusive OR | Left to right |
| 4 | && | Logical AND | Left to right |
| 3 | || | Logical OR | Left to right |
| 2 | ? : | Ternary conditional | Right to left |
| 1 | =+=-=*=/=%= | Assignment Addition assignment Subtraction assignment Multiplication assignment Division assignment Modulus assignment | Right to left |
Note: Larger number means higher precedence.
For example:
a && b || c
means
(a && b) || c
Since += associates right to left, the expression
a += b += c
means
a += (b += c)
That is, the value of b += c is added to a.
THE END
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林宏
Frank Lin
Hey, there! This is Frank Lin (@flinhong), one of the 1.41 billion . This 'inDev. Journal' site holds the exploration of my quirky thoughts and random adventures through life. Hope you enjoy reading and perusing my posts.
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