If order does not matter, you can use foo = "mppmt" "".join(set(foo)) set() will create a set of unique letters in the string, and "".join() will join the letters back to a string in arbitrary order. If order does matter,
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