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js 使用方法与函数 总结第1/4页

  • 时间:2022-01-13 19:47 编辑: 来源: 阅读:
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摘要:js 使用方法与函数 总结第1/4页
[b]1 创建脚本块[/b] 1: <script language="JavaScript"> 2: JavaScript code goes here 3: </script> [b]2 隐藏脚本代码[/b] 1: <script language="JavaScript"> 2: <!-- 3: document.write(“Hello"); 4: // --> 5: </script> 在不支持JavaScript的浏览器中将不执行相关代码 [b]3 浏览器不支持的时候显示 [/b]1: <noscript> 2: Hello to the non-JavaScript browser. 3: </noscript> [b]4 链接外部脚本文件[/b] 1: <script language="JavaScript" src="/"filename.js""></script> [b]5 注释脚本[/b] 1: // This is a comment 2: document.write(“Hello"); // This is a comment 3: /* 4: All of this 5: is a comment 6: */ [b]6 输出到浏览器[/b] 1: document.write(“<strong>Hello</strong>"); [b]7 定义变量[/b] 1: var myVariable = “some value"; [b]8 字符串相加[/b] 1: var myString = “String1" + “String2"; [b]9 字符串搜索 [/b]1: <script language="JavaScript"> 2: <!-- 3: var myVariable = “Hello there"; 4: var therePlace = myVariable.search(“there"); 5: document.write(therePlace); 6: // --> 7: </script> [b]10 字符串替换[/b] 1: thisVar.replace(“Monday","Friday"); [b]11 格式化字串[/b] 1: <script language="JavaScript"> 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: </script> [b]12 创建数组[/b] 1: <script language="JavaScript"> 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: </script> [b]13 数组排序[/b] 1: <script language="JavaScript"> 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: </script> [b]14 分割字符串[/b] 1: <script language="JavaScript"> 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: </script> [b]15 弹出警告信息[/b] 1: <script language="JavaScript"> 2: <!-- 3: window.alert(“Hello"); 4: // --> 5: </script> [b]16 弹出确认框 [/b]1: <script language="JavaScript"> 2: <!-- 3: var result = window.confirm(“Click OK to continue"); 4: // --> 5: </script> [b]17 定义函数[/b] 1: <script language="JavaScript"> 2: <!-- 3: function multiple(number1,number2) { 4: var result = number1 * number2; 5: return result; 6: } 7: // --> 8: </script> [b]18 调用JS函数[/b] 1: <a href="#" onClick="functionName()">Link text</a> 2: <a href="/"javascript:functionName"()">Link text</a> [b]19 在页面加载完成后执行函数[/b] 1: <body onLoad="functionName();"> 2: Body of the page 3: </body> [b]20 条件判断[/b] 1: <script> 2: <!-- 3: var userChoice = window.confirm(“Choose OK or Cancel"); 4: var result = (userChoice == true) ? “OK" : “Cancel"; 5: document.write(result); 6: // --> 7: </script> [b]21 指定次数循环 [/b]1: <script> 2: <!-- 3: var myArray = new Array(3); 4: myArray[0] = “Item 0"; 5: myArray[1] = “Item 1"; 6: myArray[2] = “Item 2"; 7: for (i = 0; i < myArray.length; i++) { 8: document.write(myArray[i] + “<br>"); 9: } 10: // --> 11: </script> [b]22 设定将来执行[/b] 1: <script> 2: <!-- 3: function hello() { 4: window.alert(“Hello"); 5: } 6: window.setTimeout(“hello()",5000); 7: // --> 8: </script> [b]23 定时执行函数[/b] 1: <script> 2: <!-- 3: function hello() { 4: window.alert(“Hello"); 5: window.setTimeout(“hello()",5000); 6: } 7: window.setTimeout(“hello()",5000); 8: // --> 9: </script> [b]24 取消定时执行[/b] 1: <script> 2: <!-- 3: function hello() { 4: window.alert(“Hello"); 5: } 6: var myTimeout = window.setTimeout(“hello()",5000); 7: window.clearTimeout(myTimeout); 8: // --> 9: </script> [b]25 在页面卸载时候执行函数[/b] 1: <body onUnload="functionName();"> 2: Body of the page 3: </body>
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