jquery08

2023-02-26 14:51:19

<!DOCTYPE HTML>

<html>

<head>

<meta http-equiv="Content-Type" content="text/html; charset=utf-8">

<title>无标题文档</title>

<script src="jquery-2.0.3.js"></script>

<script>

----------------------------------------------------------------------

var str = '  hello  ';

alert( '('+$.trim(str)+')' );//前后空格，不包括里面空格，

alert( '('+str.trim()+')' );

----------------------------------------------------------------------

window.onload = function(){

    var aDiv = document.getElementsByTagName('div');

    console.log( $.makeArray( aDiv ) );//[div,div,div]

    var s = 123;

    console.log( $.makeArray( s ) );//[123]

    console.log( $.makeArray( s , {length:3} ) );//Object {3: 123, length: 4}

    var str = 'hello';

    console.log( $.makeArray( str ) );//['hello']

    console.log( $.makeArray( str , {length:3} ) );//Object {3: "hello", length: 4}

    var str = {1:1,2:2};

    console.log( $.makeArray( str ) );//[{1:1,2:2}]

    console.log( $.makeArray( str , {length:3} ) );//{3:{1:1,2:2},length: 4}

};

---------------------------------------------------------------------------

var arr = ['a','b','c','d'];

alert( $.inArray( 'w' , arr ) );  indexOf

---------------------------------------------------------------------------

console.log($.merge(['a','b'],['c','d']));//["a", "b", "c", "d"]

console.log($.merge(['a','b'],{0:'c',1:'d'}));//["a", "b", "c", "d"]

console.log( $.merge({0:'a',1:'b',length:2},{0:'c',1:'d'}) );//{0: "a", 1: "b", 2: "c", 3: "d", length: 4}

console.log( $.merge({0:'a',1:'b',length:2},['c','d']) );// {0: "a", 1: "b", 2: "c", 3: "d", length: 4}

</script>

</head>

<body>

<div></div>

<div></div>

<div></div>

</body>

</html>

<!DOCTYPE HTML>

<html>

<head>

<meta http-equiv="Content-Type" content="text/html; charset=utf-8">

<title>无标题文档</title>

<script src="jquery-2.0.3.js"></script>

<script>

------------------------------------------------------------------------

var arr = [1,2,3,4];

arr = $.grep( arr , function( n , i ){//n是每一项，i是下标

    return n>2;

} , true );

console.log( arr );//[1,2]

var arr = [1,2,3,4];

arr = $.grep( arr , function( n , i ){//n是每一项，i是下标

    return n>2;

});

console.log( arr );//[3,4]

------------------------------------------------------------------------

var arr = [1,2,3,4];

arr = $.map( arr , function(n){

    return [n+1];

} );

console.log( arr );//[2,3,4,5]

------------------------------------------------------------------------

</script>

</head>

<body>

</body>

</html>

<!DOCTYPE HTML>

<html>

<head>

<meta http-equiv="Content-Type" content="text/html; charset=utf-8">

<title>无标题文档</title>

<script src="jquery-2.0.3.js"></script>

<script>

$(function(){

    function show(){

        alert(this);

    }

    $('input:eq(0)').click(  show  );

    $('input:eq(1)').click(function(){

        $('input:eq(0)').off();//取消第一个的绑定

    });

});

$(function(){

    function show(){

        alert(this);

    }

    $('input:eq(0)').click(  $.proxy(show,window)  );//改变show的this是window，

    $('input:eq(1)').click(function(){

        $('input:eq(0)').off();//取消第一个的绑定

    });

});

--------------------------------------------------------------------------

function show(n1,n2){

    alert(n1);

    alert(n2);

    alert(this);

}

show();//window

$.proxy(show,document)(3,4);//改变show的this是document,执行，$.proxy()返回值是一个函数名函数地址，加小括号返回的函数才执行，

$.proxy(show,document,3)(4);//改变show的this是document,执行，

$.proxy(show,document,3);//不执行,返回函数地址，

var obj = {

    show : function(){

        alert(this);

    }

};

$(document).click( obj.show );//this是document

$(document).click( $.proxy(show,obj) );//this是obj

$(document).click( $.proxy(obj,'show') );//让obj下面的show指向obj

//$.proxy(obj,'show') ->  $.proxy(obj.show,obj)

</script>

</head>

<body>

<input type="button" value="点击">

<input type="button" value="取消绑定">

</body>

</html>

<!DOCTYPE HTML>

<html>

<head>

<meta http-equiv="Content-Type" content="text/html; charset=utf-8">

<title>无标题文档</title>

<script src="jquery-2.0.3.js"></script>

<script>

$().css();  $().attr();  set/get

$(function(){

    alert( $('#div1').css('width') );

    $('#div1').css('background','yellow');

    $('#div1').css('background','yellow');

    $('#div1').css('width','300px');

    $('#div1').css({ background : 'yellow' , width : '300px' });

    alert( $.now() );//1970年的时间

    (new Date()).getTime()

});

</script>

</head>

<body>

<div id="div1" style="width:100px; height:100px; background:red">aaaa</div>

</body>

</html>

<!DOCTYPE HTML>

<html>

<head>

<meta http-equiv="Content-Type" content="text/html; charset=utf-8">

<title>无标题文档</title>

<script src="jquery-2.0.3.js"></script>

<script>

$(function(){

alert( $('#div1').width() );//display:none还是获取到了，利用的是swap方法

alert( $('#div1').get(0).offsetWidth );//原生的宽度方法，display:none就获取不到了

    function show(){

        arguments.length

    }

    show(1,2,3,4);

});

</script>

</head>

<body>

<div id="div1" style="width:100px; height:100px; background:red;display:block; visibility:hidden; position:absolute;">aaaa</div>

</body>

</html>

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