Javascript custom type, attribute, method example code summary
Javascript commonly used custom types, attributes, and methods are organized. Friends in need can refer to it.
1. Define the type
function UserObject(parameter) {
}parameter can be omitted, which is equivalent to the constructor parameter in C#.
2. Instantiate the custom type
<script type="text/javascript">
function userobject(parameter){
}
//myobject is now an object of type userobject!
var myobject=new userobject("hi")
alert(myobject)
</script>3. Add attributes
function userobject(parameter){
this.firstproperty=parameter
this.secondproperty="This is the second property"
}//Use
<script>
var myobject=new userobject("hi there.")
//alerts "hi there."
alert(myobject.firstproperty)
//writes "This is the second property"
document.write(myobject.secondproperty)
</script>4. Add method (circle class)
//first method function
function computearea(){
var area=this.radius*this.radius*3.14
return area
}
//second method function
function computediameter(){
var diameter=this.radius*2
return diameter
}Associate to custom type:
<script type="text/javascript">
/*the below creates a new object, and gives it the two methods defined earlier*/
function circle(r){
//property that stores the radius
this.radius=r
this.area=computearea
this.diameter=computediameter
}
</script>Use custom method:
<script type="text/javascript">
var mycircle=new circle(20)
//alerts 1256
alert("area="+mycircle.area())
//alerts 400
alert("diameter="+mycircle.diameter())
</script>The above is the detailed content of Javascript custom type, attribute, method example code summary. For more information, please follow other related articles on the PHP Chinese website!
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