JQuery User Manual (iv) _ jquery

JQuery user manual. You can read it patiently and get started. Thu:JavaScript processing

$. Browser () determines the browser type and returns the boolen Value $ (Function(){
If($. Browser. msie ){
Alert ("This is an Internet browser.");}
Else If($. Browser. opera ){
Alert ("This is an operabrowser.");}
})When the page load type determines the browser type, the types that can be determined include msie, mozilla, opera, and safari.

$. Each (obj, fn)Obj is an object or array, and fn is a function executed in sequence on obj. Note that $ (). each () is distinguished () $. Each ([0,1,2],Function(I) {alert ("Item #" +I+ ":" + This);});Input 0, 1, 2 as parameters to function (I) respectively.$. Each ({name:"John", Lang:"JS"},Function(I) {alert ("Name:" +I+ ", Value:" + This);{Name: "John", lang: "JS"} is a hash object. Each group of hash objects is input to the function in sequence.

$. Extend (obj, prop)Extend the first object with the second object VarSettings={Validate:False, Limit:5, Name:"Foo"};
VarOptions={Validate:True, Name:"Bar"};
$. Extend (settings, options );After execution, the settings object is {validate: true, limit: 5, name: "bar "}
You can use the following function to test$ (Function(){
VarSettings={Validate:False, Limit:5, Name:"Foo"};
VarOptions={Validate:True, Name:"Bar"};
$. Extend (settings, options );
$. Each (settings,Function(I) {alert (I+ "=" + This);});
})
$. Grep (array, fn)Use the fn function to filter the array. Pass the elements in the array to fn in sequence. The fn must return a boolen. If fn returns true, it will be filtered. $ (Function(){
VarArr=$. Grep ([0,1,2,3,4],Function(I ){ReturnI> 2;});
$. Each (arr,Function(I) {alert (I );});
})We can see that the array [, 4] After $. grep is executed becomes [].

$. Merge (first, second)Both parameters are arrays. The second array is the same as the first one, and then the two arrays are merged. $ (Function(){
VarArr=$. Merge ([0,1,2], [2,3,4])
$. Each (arr,Function(I) {alert (I );});
})The result of arr is [0, 1, 2, 3, 4].

$. Trim (str)Removes spaces at both ends of a string.
$. Trim ("hello, how are you? ") The result is" hello, how are you? "