单项选择题
You create a Web page that contains the following code.
You need to provide the following implementation. Each time the AddFile button is clicked, a new div element is created. The new div element is appended after the other file upload div elements and before the AddFile span. Each new element has a unique identifier. Which code segment should you use?()
A.$("#AddFile").click(function () {var id = "File" + ++lastId; var item =$(".File:first").clone(true); $("input:file", item).attr({ id: id, name: id }); item.insertBefore("#AddFile"); });
B.$("#AddFile").click(function () {var id = "File" + ++lastId;$(".File:first").clone(true).attr({ id: id, name: id }).insertBefore("#AddFile"); });
C.$("#AddFile").click(function () {var id = "File" + ++lastId; });
D.$("#AddFile").click(function () {var id = "File" + ++lastId;var item = $(".File:first").clone(true); $("input:file", item).attr({ id: id, name: id }); item.insertAfter("input[type=file]"); });
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YoucreateaWebpagethatcontainsthefollowingdiv.YouhaveaJavaScriptarraynamedimageurlsthatcontainsalistofimageURLs.YouneedtowriteaJavaScriptfunctionthatwillinsertimagesfromtheURLsintotarget.Whichcodesegmentshouldyouuse?()
A.$(imageurls).each(function(i,url){ $("
", url).append("#target"); });
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C.$.each(imageurls, function(i,url){ $("").attr("src", url).appendTo("#target"); });
D.$.each(imageurls, function(i,url){$("#target").append("").src = url; });
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A Web page includes the HTML shown in the following code segment. You need to write a JavaScript function that will dynamically format in boldface all of the hyperlinks in the ref span.Which code segment should you use?()
A.$("#ref").filter("a[href]").bold();
B.$("ref").filter("a").css("bold");
C.$("a").css({fontWeight:"bold"});
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You create a Web page that contains the following image element. You need to write a JavaScript function that will dynamically change which image is displayed. Which code segment should you use?()
A.function changeImage() {myImage.src = "image2.png"; }
B.function changeImage() { document.getElementById("myImage").src = "image2.png"; }
C.function changeImage() { getElementById("myImage").src = "image2.png"; }
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