JS gets the nth element node

A function to get the nth element node, now only gets the element through the first entry HTML tag, the function is not perfect

Demo: HTML

<ulID= "List">    <Li>1<Button>A</Button></Li>    <Li>2<Button>B</Button><Button>O</Button></Li>    <P>Test</P>    <Li>3<Button>C</Button></Li>    <Li>4<Button>D</Button></Li>    <Li>5<Button>E</Button></Li></ul>

Js:

1 /**2   *3 * @param parent Parents node4 * @param ele the element label to select5 * Number of elements @param num6 * @return {*}7   */8 functionNth (parent,ele,num) {9     var_ele=array.prototype.slice.call (parent.childnodes), elearray=[];Ten      //converts a child node of a parent node to an array of _ele;elearray as a storage element node only One      for(varI= 0,len=_ele.length;i<len;i++){ A       if(_ele[i].nodetype==1){ -Elearray.push (_ele[i]);//filter out non-element nodes -         } the     } -     if(arguments.length===2){ -         //If only 2 parameters are passed in, if the second argument is a number, select the first element under the parent node -         //If the second argument is a string, select the node represented by all parameters under the parent node +         if(typeofarguments[1]=== "string"){ -_ele=array.prototype.slice.call (Parent.getelementsbytagname (arguments[1])); +             return_ele; A}Else if(typeofarguments[1]=== "Number"){ at             returnElearray[arguments[1]]; -         } -}Else{ -         //If the parameter is complete, the first node is returned, and the index starts at 0. -_ele=Array.prototype.slice.call (Parent.getelementsbytagname (ele)); -         return_ele[num]; in     } - } to  /* + Test -   */ the     varList=document.getelementbyid ("list"); *Console.log (Nth (list, "Li", 2). InnerHTML);//Select a third LI element $Console.log (Nth (List, "button", 3). InnerHTML)//Select the fourth buttonPanax NotoginsengConsole.log (Nth (list, "Li", 1), "button", 1). InnerHTML);//Select the second button under the second Li -Console.log (Nth (nth (list, "Li", 1), "button"));//Select All buttons under the second Li theConsole.log (nth (list,2));//Pick a second element

JS gets the nth element node