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trim()方法,删除头尾的空白串。
function myTrim(str) {
if(str.slice(0,1) != " " && str.slice(-1) != " "){
return str;
}
else if(str.slice(0,1) == " "){
return trim(str.slice(1));
}else{
return trim(str.slice(0,-1));
}
}