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JavaScript使用方法和技巧（一）

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1 建立指令碼塊

1: <s cript language=”Javas cript”>
2: Javas cript code goes here
3: </s cript>

 

2 隱藏指令碼代碼

1: <s cript language=”Javas cript”>
2: <!--
3: document.write(“Hello”);
4: // -->
5: </s cript>

在不支援Javas cript的瀏覽器中將不執行相關代碼

3 瀏覽器不支援的時候顯示

1: <nos cript>
2: Hello to the non-Javas cript browser.
3: </nos cript>

 

4 連結外部指令檔

1: <s cript language=”Javas cript” src="/”filename.js"”></s cript>

5 注釋指令碼

1: // This is a comment
2: document.write(“Hello”); // This is a comment
3: /*
4: All of this
5: is a comment
6: */

 

6 輸出到瀏覽器

1: document.write(“<strong>Hello</strong>”);

 

7 定義變數

1: var myVariable = “some value”;

 

8 字串相加

1: var myString = “String1” + “String2”;

 

9 字串搜尋

1: <s cript language=”Javas cript”>
2: <!--
3: var myVariable = “Hello there”;
4: var therePlace = myVariable.search(“there”);
5: document.write(therePlace);
6: // -->
7: </s cript>

 

10 字串替換

1: thisVar.replace(“Monday”,”Friday”);

11 格式化字串

1: <s cript language=”Javas cript”>
2: <!--
3: var myVariable = “Hello there”;
4: document.write(myVariable.big() + “<br/>”);
5: document.write(myVariable.blink() + “<br/>”);
6: document.write(myVariable.bold() + “<br/>”);
7: document.write(myVariable.fixed() + “<br/>”);
8: document.write(myVariable.fontcolor(“red”) + “<br/>”);
9: document.write(myVariable.fontsize(“18pt”) + “<br/>”);
10: document.write(myVariable.italics() + “<br/>”);
11: document.write(myVariable.small() + “<br/>”);
12: document.write(myVariable.strike() + “<br/>”);
13: document.write(myVariable.sub() + “<br/>”);
14: document.write(myVariable.sup() + “<br/>”);
15: document.write(myVariable.toLowerCase() + “<br/>”);
16: document.write(myVariable.toUpperCase() + “<br/>”);
17:
18: var firstString = “My String”;
19: var finalString = firstString.bold().toLowerCase().fontcolor(“red”);
20: // -->
21: </s cript>

 

12 建立數組

1: <s cript language=”Javas cript”>
2: <!--
3: var myArray = new Array(5);
4: myArray[0] = “First Entry”;
5: myArray[1] = “Second Entry”;
6: myArray[2] = “Third Entry”;
7: myArray[3] = “Fourth Entry”;
8: myArray[4] = “Fifth Entry”;
9: var anotherArray = new Array(“First Entry”,”Second Entry”,”Third Entry”,”Fourth Entry”,”Fifth Entry”);
10: // -->
11: </s cript>

 

13 數組排序

1: <s cript language=”Javas cript”>
2: <!--
3: var myArray = new Array(5);
4: myArray[0] = “z”;
5: myArray[1] = “c”;
6: myArray[2] = “d”;
7: myArray[3] = “a”;
8: myArray[4] = “q”;
9: document.write(myArray.sort());
10: // -->
11: </s cript>

 

14 分割字串

1: <s cript language=”Javas cript”>
2: <!--
3: var myVariable = “a,b,c,d”;
4: var stringArray = myVariable.split(“,”);
5: document.write(stringArray[0]);
6: document.write(stringArray[1]);
7: document.write(stringArray[2]);
8: document.write(stringArray[3]);
9: // -->
10: </s cript>

 

15 彈出警告資訊

1: <s cript language=”Javas cript”>
2: <!--
3: window.alert(“Hello”);
4: // -->
5: </s cript>

 

16 彈出確認框

1: <s cript language=”Javas cript”>
2: <!--
3: var result = window.confirm(“Click OK to continue”);
4: // -->
5: </s cript>

 

17 定義函數

1: <s cript language=”Javas cript”>
2: <!--
3: function multiple(number1,number2) {
4: var result = number1 * number2;
5: return result;
6: }
7: // -->
8: </s cript>

 

18 調用JS函數

1: <a href=”#” onClick=”functionName()”>Link text</a>
2: <a href="/”javas cript:functionName"()”>Link text</a>

 

19 在頁面載入完成後執行函數

1: <body onLoad=”functionName();”>
2: Body of the page
3: </body>

20 條件判斷

1: <s cript>
2: <!--
3: var userChoice = window.confirm(“Choose OK or Cancel”);
4: var result = (userChoice == true) ? “OK” : “Cancel”;
5: document.write(result);
6: // -->
7: </s cript>

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