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less than the number of parameters specified when the function is declared, and the remaining parameters are set to the undefined value .15. You can use the annotation/*optional*/in the function definition to emphasize that the formal parameter is optional .16, identifier arguments is a reference to an argument object, an argument object is a class array object , not a real array, it is an object that happens to have a numeric indexed property.17. The argument object also defines the callee and

${file#*.} : Take out the first one. And the string to the left: file.txt${file##*.} : Take out the last one. And the string to the left: txt${file%/*}: Take off the last bar/its right string:/dir1/dir2/dir3${file%%/*}: Remove the first/its right string: (null value)${FILE%.*}: Take off the last one. And the string to the right:/dir1/dir2/dir3/my.file${FILE%%.*}: Take out the first one. And the string to the right:/dir1/dir2/dir3/myThis article is from the "Linux is belong to You" blog, make sur

The third edition of CSS3 tips covers HTML5 Study Notes 6 ~ Chapter 8, css3html5Part 2 ---- chapter 6th of CSS practical technology, specifying the alternative font for Text Formatting: font-family: Arial, Helvetica, sans-serif; when the visitor does not install the first font, the browser continues searching in the list until the backup font is found. If the font name contains multiple words, you must encl