JavaScript设置FieldSet展开与收缩_javascript技巧

// 设置FieldSet高度方法，支持IE浏览器、Firefox
// 参数1：pTableID，FieldSet内部div或table的id
// 参数2：pFieldSetID，FieldSet的ID
// 参数3：pImageID，图片的ID，展开或收缩后更新图片SRC
function FieldSetVisual( pTableID, pFieldSetID, pImageID )
{
var objTable = document.getElementById( pTableID ) ;
var objFieldSet = document.getElementById( pFieldSetID) ;
var objImage = document.getElementById( pImageID) ;
if( objTable.style.visibility == 'visible' )
{
objTable.style.visibility = 'hidden' ;
objFieldSet.style.height = "22px" ;
objImage.src="images/expand.png" ;
}
else
{
objTable.style.visibility = 'visible';
var heightFieldSet = parseInt( objFieldSet.style.height.substr(0,objFieldSet.style.height.length-2)) ;
var heightTable = parseInt( objTable.offsetHeight ) ;
objFieldSet.style.height = heightFieldSet + heightTable + "px" ;
objImage.src="https://www.gxlcms.com/images/constringency.png" ;
}
}