第一种:循环检查替换 [javascript] //供使用者调用 function trim(s){ return trimRight(trimLeft(s)); } //去掉左边的空白 function trimLeft(s){ if(s == null) { return ""; } var whitespace = new String(" \t\n\r"); var str = new String(s); if (whitespace.indexOf(st…
print 函数的打印格式: ##no quote print out > x <- letters[1:5] > print(x,quote=F,);print(x,quote=T) [1] a b c d e [1] "a" "b" "c" "d" "e" ##print without number of vector and quote > cat(x) a b c d e…