Optimize JavaScript execution Speed _javascript tips

1: Modify how the loop executes

for (Var i=0;i<element.childnodes.length;i++) {
Executing code
}
This method takes a Element.childNodes.length value for Each loop, and should be changed to the following
var n=element.childnodes.length
for (Var i=0;i<n;i++) {
Executing code
}

2: The number of times the DOM operation was modified
Dom to BULK insert a batch of similar nodes first construct an object and insert a
For example, the following method is reasonable:
var div=document.createelement ("div");
for (var i=0;i<10;i++) [

var element=document.createelement ("a");
A.href= "";
Div.appendchild (Element);

}
After you build the object, insert it once
Document.body.appendChild (DIV);
3: Reduce the reference level of the object, you can reduce the complexity of the browser to resolve the object

For example, a method is net. Loader.loadxml (params)
You don't have to use it every time.
var loadxml=net. Loader.loadxml;
Loadxml (params);