specified参数属性

DHTML文档教程

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Retrieves whether an attribute has been specified.

dhtml语法

[ bSpecified = ] attribute.specified

DHTML可能的值

bSpecified

Boolean that receives one of the following values: true Attribute is specified. false Attribute is not specified.

The property is read-only. The property has no default value.

Remarks

An attribute is specified if it is set through HTML or script.

DHTML代码范例

This example uses the specified property to determine the attributes set for an object. The function checks each attribute, and lists all of the attributes of the object and the value of each attribute. In addition, each attribute that is set is displayed.

<SCRIPT>
function fnFindSpecified(){
var oAttributes=oList.attributes;
alert(oAttributes(0).nodeName);
for(var i=0;i<oAttributes.length;i++){
var oNode=document.createElement("LI");
var oNodeValue=document.createTextNode(i + " "
+ oAttributes(i).nodeName + " = "
+ oAttributes(i).nodeValue);
oList.appendChild(oNode);
oNode.appendChild(oNodeValue);
if(oAttributes(i).nodeValue!=null){
alert(oAttributes(i).nodeName
+ " specified: " + oAttributes(i).specified);
}
}
}
</SCRIPT>
<UL ID = oList onclick = "fnFindSpecified()">
<LI>Click to Find Specified Attributes
</UL>

是否符合公共标准

This property is defined in World Wide Web Consortium (W3C) Document Object Model (DOM) Level 1 .

Applies To

	attribute

更多语法参考

About the W3C Document Object Model