advancing in js Scripting languages pt4.pptx

advancing in js Scripting languages pt4.pptx

• 1.
  Scripting languages Brian kathabasya
• 2.
  JavaScript String  TheJavaScript string is an object that represents a sequence of characters.  There are 2 ways to create string in JavaScript 1. By string literal 2. By string object (using new keyword)
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  By string literal The string literal is created using double quotes 1. <script> 2. var str="This is string literal"; 3. document.write(str); 4. </script>
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  By string object(using new keyword) 1. Here, new keyword is used to create instance of string. 2. <script> 3. var stringname=new String("hello javascript string"); 4. document.write(stringname); 5. </script>
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  JavaScript String charAt(index)Method  The JavaScript String charAt() method returns the character at the given index. 1. <script> 2. var str="javascript"; 3. document.write(str.charAt(2)); 4. </script>
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  JavaScript String concat(str)Method 1. The JavaScript String concat(str) method concatenates or joins two strings. 2. <script> 3. var s1="javascript "; 4. var s2="concat example"; 5. var s3=s1.concat(s2); 6. document.write(s3); 7. </script>
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  JavaScript String indexOf(str)Method 1. <script> 2. var s1="javascript from javatpoint indexof"; 3. var n=s1.indexOf("from"); 4. document.write(n); 5. </script>
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  JavaScript String lastIndexOf(str) Method The JavaScript String lastIndexOf(str) method returns the last index position of the given string. 1. <script> 2. var s1="javascript from javatpoint indexof"; 3. var n=s1.lastIndexOf("java"); 4. document.write(n); 5. </script>
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  JavaScript String toLowerCase() Method 1.The JavaScript String toLowerCase() method returns the given string in lowercase letters. 2. <script> 3. var s1="JavaScript toLowerCase Example"; 4. var s2=s1.toLowerCase(); 5. document.write(s2); 6. </script>
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  JavaScript String toUpperCase() Method The JavaScript String toUpperCase() method returns the given string in uppercase letters. 1. <script> 2. var s1="JavaScript toUpperCase Example"; 3. var s2=s1.toUpperCase(); 4. document.write(s2); 5. </script>
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  JavaScript String slice(beginIndex,endIndex) Method  The JavaScript String slice(beginIndex, endIndex) method returns the parts of string from given beginIndex to endIndex.  In slice() method, beginIndex is inclusive and endIndex is exclusive. 1. <script> 2. var s1="abcdefgh"; 3. var s2=s1.slice(2,5); 4. document.write(s2); 5. </script>
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  JavaScript String trim()Method 1. <script> 2. var s1=" javascript trim "; 3. var s2=s1.trim(); 4. document.write(s2); 5. </script>
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  JavaScript String split()Method 1. <script> 2. var str="This is JavaTpoint website"; 3. document.write(str.split(" ")); //splits the given string. 4. </script>
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  JavaScript Date Object The JavaScript date object can be used to get year, month and day. You can display a timer on the webpage by the help of JavaScript date object.  You can use different Date constructors to create date object. It provides methods to get and set day, month, year, hour, minute and seconds.  Constructor  You can use 4 variant of Date constructor to create date object. 1. Date() 2. Date(milliseconds) 3. Date(dateString) 4. Date(year, month, day, hours, minutes, seconds, milliseconds
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  JavaScript Date Methods 1.Current Date and Time: <span id="txt"></span> 2. <script> 3. var today=new Date(); 4. document.getElementById('txt').innerHTML=today; 5. </script>
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  JavaScript Date Methods 1.<script> 2. var date=new Date(); 3. var day=date.getDate(); 4. var month=date.getMonth()+1; 5. var year=date.getFullYear(); 6. document.write("<br>Date is: "+day+"/"+month+"/"+year); 7. </script>
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  JavaScript Current TimeExample 1. Current Time: <span id="txt"></span> 2. <script> 3. var today=new Date(); 4. var h=today.getHours(); 5. var m=today.getMinutes(); 6. var s=today.getSeconds(); 7. document.getElementById('txt').innerHTML=h+":"+m+":"+s; 8. </script>