JavaScript constructor属性
Definition and Usage
定义与用法The constructor property is a reference to the function that created an object.
constructor属性是所建立对象的函数参考Syntax
语法object.constructor
Example 1
举例
In this example we will show how to use the constructor property:
在这个举例中我们将展示如何使用constructor属性：
<script type="text/javascript">
var test=new Array()
if (test.constructor==Array)
{document.write("This is an Array")}
if (test.constructor==Boolean)
{document.write("This is a Boolean")}
if (test.constructor==Date)
{document.write("This is a Date")}
if (test.constructor==String)
{document.write("This is a String")}
</script>
The output of the code above will be:
输出结果为：
This is an Array
Example 2
举例2
In this example we will show how to use the constructor property:
在这个举例中我们将展示如何使用constructor属性：
<script type="text/javascript">
function employee(name,jobtitle,born)
{
this.name=name
this.jobtitle=jobtitle
this.born=born
}
var fred=new employee("Fred Flintstone","Caveman",1970)
document.write(fred.constructor)
</script>
The output of the code above will be:
输出结果为：
function employee(name, jobtitle, born)
{this.name = name; this.jobtitle = jobtitle; this.born = born;}
Try-It-Yourself Demos
尝试与演示
constructor - example 1
In this example we will show how to use the constructor property.
在这个举例中我们将展示如何使用constructor属性
constructor - example 2
In this example we will show how to use the constructor property.
在这个举例中我们将展示如何使用constructor属性
http://www.w3pop.com/learn/view/doc/jsref_constructor_array/
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讲上面红色显示的插入到网页中就可以实现鼠标右击无效
......
1. 应用 Array.prototype.join实现字符合并
方法1.
String.prototype.times = function(n) {
return Array.prototype.join.call({length:n+1}, this);
};
"js".times(5) // => "jsjsjsjsjs"
方法2.
var ArrayTest=new Array("HE","LL","O");
var hello = Array.prot ......
删除行
<script>
function del(obj)
{
obj.parentNode.parentNode.removeNode(true);
}
</script>
<body& ......
reg = /^((((((0[48])|([13579][26])|([2468][048]))00)|([0-9][0-9]((0[48])|([13579][26])|([2468][048]))))-02-29)|(((000[1-9])|(00[1-9][0-9])|(0[1-9][0-9][0-9])|([1-9][0-9][0-9][0-9]))-((((0[13578])|(1[02]))-31)|(((0[1,3-9])|(1[0-2]))-(29|30))|(((0[1-9])|(1[0-2]))-((0[1-9])|(1[0-9])|(2[0-8]))))))$/i; ......
1. document.write( " "); 输出语句
2.JS中的注释为//
3.传统的HTML文档顺序是:document- >html- >(head,body)
4.一个浏览器窗口中的DOM顺序是:window- >(navigator,screen,history,location,document)
5.得到表单中元素的名称和值:document.getElementById( "表单 ......
