/*兼容低版本浏览器的getElementByClassName方法*/
function getElementsByClassName(root,className){
if(root.getElementsByClassName){
return root.getElementsByClassName(className);
}else{
var elements=root.getElementsByTagName();
var result=[];
for(var i=0,element;element=elements[i];i++){
//hasClassName判断元素是否有className属性
if(hasClassName(element,className)){
result.push(element);
}
}
return result;
}
}
// ----------------------------------------------------------------------------
// HasClassName
//
// Description : returns boolean indicating whether the object has the class name
// built with the understanding that there may be multiple classes
//
// Arguments:
// element - element to manipulate
// className - class name to add
//
function hasClassName(element, className)
{
// if there is a class
if ( element.className )
{
// the classes are just a space separated list, so first get the list
var arrList = element.className.split(' ');
// get uppercase class for comparison purposes
var classNameUpper = className.toUpperCase();
// find all instances and remove them
for ( var i = 0; i < arrList.length; i++ )
{
// if class found
if ( arrList[i].toUpperCase() == classNameUpper )
{
// we found it
return true;
}
}
}
// if we got here then the class name is not there
return false;
}
//----------------------------------------------------------------
function getElementsByClassName(element, names) {
if (element.getElementsByClassName) {
return element.getElementsByClassName(names);
} else {
var elements = element.getElementsByTagName('*');
var result = [];
var element,
classNameStr,
flag;
names = names.split(' ');
for (var i = 0; element = elements[i]; i++) {
classNameStr = ' ' + element.className + ' ';
flag = true;
for (var j = 0, name; name = names[j]; j++) {
if (classNameStr.indexOf(' ' + name + '') == -1) {
flag = false;
break;
}
}
if (flag) {
result.push(element);
}
}
return result;
}
}