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Make a small advertisement before you start: The story of a Chinese girl and a programmer written by my girlfriend: "Time is too narrow, fingers are too wide". Before starting with object-oriented, we should first simplify the above Code,
Person.future=function dream(){future;}
var Person=function(){this.name="phodal";this.weight=50;this.height=166;this.future=function dream(){return "future";};};var person=new Person();document.write(person.name+"<br>");document.write(typeof person+"<br>");document.write(typeof person.future+"<br>");document.write(person.future()+"<br>");
document.write(3*4);Similarly, it is not flexible, so after we complete the function, we need to optimize it, which is the true meaning of program design-after solving the actual problem, we need to start the real design, instead of programming for solving the problem.
var Person=function(name,weight,height){this.name=name;this.weight=weight;this.height=height;this.future=function(){return "future";};};var phodal=new Person("phodal",50,166);document.write(phodal.name+"<br>");document.write(phodal.weight+"<br>");document.write(phodal.height+"<br>");document.write(phodal.future()+"<br>");Therefore, such a reusable Javascript Object is generated. The this keyword establishes the property owner.
var Chinese=function(){this.country="China";}var Person=function(name,weight,height){this.name=name;this.weight=weight;this.height=height;this.futrue=function(){return "future";}}Chinese.prototype=new Person();var phodal=new Chinese("phodal",50,166);document.write(phodal.country);The complete Javascript should consist of the following three parts:
<!DOCTYPE html>
Modify to add helloworld.html
<p id="para" style="color:red">Red</p>At the same time, you also need to move the script tag to the body. If there is no accident, we will see Red in Red on the page and modify app. js.
var para=document.getElementById("para");para.style.color="blue";Then, the font turns blue. with DOM, we can operate on the page. We can say that most of the page effects we see are achieved through DOM operations.
The beauty of the Javascript mentioned here is only a small part. Many things are ignored. The only concern is how to design a practical app as a programming language, he also has other powerful internal functions and needs a valuable reference book to learn well. The only thing mentioned here is less than 20% of the items, and the other 80% or more will appear when you solve the problem.
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