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Why are there so many assignment operators If I can write x=x+1 instead of x+=1, why do I need to know about the extra assignment operators They are provided as shortcuts, so that you don t need to type the variable name a second time in the same line They also cut down the overall size of the script a bit, which helps with the loading time of the Web page You can use either method; it just depends on how much you want to trim the script size or avoid extra typing Also, it is good to know what these assignment operators do, so that you can recognize their purpose in scripts Can I use more than one operator at a time in a statement What will happen if I do that Yes, you can use multiple operators in a single statement The operators will be executed according to their precedence in the order of operations, which is covered in the next section

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7 Designate this browser as the primary preview browser by selecting the Primary Browser check box 8 Click OK One down, one to go! 9 Click the plus button again, and this time navigate to the location of Netscape 62 s EXE file Double-click the file 10 If Dreamweaver doesn t auto-fill a human-useful name, type Netscape 62 in the Name field 11 Check the Secondary Browser option and click OK Your browser list should look like the following illustration If it doesn t, select the browser that doesn t match up, click the Edit button, and change the Name field

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12 Click OK to close the Preferences dialog box Good job!

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What is with all of the parentheses Why are they used in some cases but not in others Is there a reason for them The parentheses used so far have been added for the readability of the statements In some cases, it is necessary to use parentheses to get a desired result This is something else that is covered in the next section Are there any common typos that are made with all of these operators Often, the assignment operator (=) gets used in place of the comparison operator (==) because the second equal sign is left off by accident Also, forgetting to use && and typing just & is another common typo that can cause trouble in a script The same sort of mistake can occur with the logical OR (||) and bitwise OR (|) operators

You can preview a page from Dreamweaver at any time during production To preview the current document window in the primary browser, click F12 To preview the current document window in the secondary browser, click CTRL-F12 (Windows) or COMMAND-F12 (Mac) If you want to use a different browser to preview the current document window, choose File | Preview In Browser from the main menu and select the browser from the submenu

In JavaScript, the operators have a certain order of precedence In a statement with more than one operator involved, one may be executed before another, even though it is not in that order in the statement For instance, look at this example:

Remember that pressing F12 launches the primary preview browser The exam may try to slip you up with alternative function-key references like F1 or F10 For your information, pressing F1 calls up Help, and F10 opens the Code Inspector panel

var answer=8+7*2;

If you remember how this works in mathematics, you will know that the multiplication is performed first on the 7*2 part of the statement, even though it does not look like that is the right order when you read from left to right The reason the multiplication is performed first is that the multiplication operator has a higher precedence in the order of operations than the addition operator So, any multiplication done within a statement will be performed before any addition, unless you override it somehow As with math problems, in JavaScript, the way to override the order of operations is through the use of parentheses to set off the portion of the statement that should be executed first Thus, if you wanted to be sure the addition was performed first in the preceding example, you would write it as shown here instead:

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var answer=(8+7)*2;

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