day24
特性 attributes VS 属性 properties
attribute:
值为string
不区分大小写
会在html中呈现
property:
值为string,boolean,number,object
区分大小写
不影响html
1.如果attributes是本来在DOM对象中就存在的,attributes和
properties的值会同步;
2.如果attributes是本来在DOM对象中就存在的,但是类型为
Boolean,那么attributes和properties的不会同步;
3.如果attributes不是DOM对象内建的属性,attributes和
properties的值不会同步;
操作元素的特性
获取特性的值:attr(name)
设置特性的值:attr(name.value) attr({title:‘new title‘}) atrr(name,function(index,previousValue){})
删除特性:removeAttr(name) 加空格可以多个删除
操作元素的属性
获取属性的值:prop(name)
设置属性的值:prop(name,value)prop(properties)
删除属性:removeProp(name) 加空格不能多个删除
在元素中存取数据
获取数据的值:data([name])
设置数据的值:data(name,value) data(object)
删除数据的值:removeData(name)
判断是否有数据:jQuery.hasData(element)
特性属性.html:
<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <title>Document</title> </head> <body> <img id="logo" src="log.jpg" alt="jQuery logo" class="img-jQuery" title="jQuery logo"> <img id="logo2" src="log.jpg" alt="jQuery logo2" class="img-jQuery2" title="jQuery logo2"> <input type="checkbox" id="check" tabindex="1" style="width: 50px; height: 50px;" title="check this!" description="just a checkbox" checked> <script src="jquery-3.3.1.js"></script> <script> /*var logo = document.getElementById(‘logo‘) console.log(logo); console.log(logo.title); console.log(logo.getAttribute("title"));*/ // var check = document.getElementById(‘check‘); /*console.log(check.checked); console.log(check.getAttribute(‘checked‘)); check.setAttribute(‘checked‘,false); console.log(check.checked); console.log(check.getAttribute(‘checked‘));*/ /* console.log(check.description); console.log(check.getAttribute(‘description‘)); check.description = ‘just‘; check.setAttribute(‘description‘,‘asdf‘); console.log(check.description); console.log(check.getAttribute(‘description‘));*/ </script> </body> </html>
操作元素的属性.html:
<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <title>Document</title> </head> <body> <img id="logo" src="log.jpg" alt="jQuery logo" class="img-jQuery" title="jQuery logo"> <img id="logo2" src="log.jpg" alt="jQuery logo2" class="img-jQuery2" title="jQuery logo2"> <input type="checkbox" id="check" tabindex="1" style="width: 50px; height: 50px;" title="check this!" description="just a checkbox" checked = ‘checked‘> <script src="jquery-3.3.1.js"></script> <script> $(function () { //获取属性 console.log($(‘#check‘).prop(‘checked‘)) //设置属性 console.log($(‘#check‘).prop(‘checked‘,true)) console.log($(‘#check‘).attr(‘checked‘)) //删除属性 console.log($(‘#check‘).removeProp(‘checked‘)) console.log($(‘#check‘).removeProp(‘title‘)) console.log($(‘#check‘).prop(‘title‘)) console.log($(‘#check‘).prop(‘checked‘)) }) </script> </body> </html>
操作元素的特性.html:
<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <title>Document</title> </head> <body> <img id="logo" src="log.jpg" alt="jQuery logo" class="img-jQuery" title="jQuery logo"> <img id="logo2" src="log.jpg" alt="jQuery logo2" class="img-jQuery2" title="jQuery logo2"> <input type="checkbox" id="check" tabindex="1" style="width: 50px; height: 50px;" title="check this!" description="just a checkbox" checked> <script src="jquery-3.3.1.js"></script> <script> $(function () { console.log($("#check")); //获取特性 console.log($(‘#check‘).attr(‘title‘)) //设置特性 $(‘#check‘).attr(‘title‘,‘check that!‘) console.log($(‘#check‘).attr(‘title‘)) //删除特性 $("#check").removeAttr(‘title‘) console.log($(‘#check‘).attr(‘title‘)) }) </script> </body> </html>
在元素中存取数据.html:
<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <title>Document</title> </head> <body> <img id="logo" src="log.jpg" alt="jQuery logo" class="img-jQuery" title="jQuery logo" data-data1 = ‘123‘> <img id="logo2" src="log.jpg" alt="jQuery logo2" class="img-jQuery2" title="jQuery logo2"> <input type="checkbox" id="check" style="width: 50px; height: 50px;" title="check this!" data-data2 = ‘false‘ description="just a checkbox" checked = ‘checked‘ tabindex="1"> <p></p> <script src="jquery-3.3.1.js"></script> <script> $(function () { var img = $(‘img‘) var check = $(‘#check‘) //获取数据 console.log(img.data()) //设置数据 check.data(‘dat‘,true) console.log(check.data()) //删除数据 check.removeData(‘dat‘) console.log(check.data()) //判断是否有数据 console.log($.hasData(check.get(0))) console.log($.hasData($(‘p‘).get())) }) </script> </body> </html>