100多常用的JS语句

jopen 11年前

1.document.write( " ");输出语句
2.JS中的注释为//
3.传统的HTML文档顺序是:document- >html- >(head,body)
4.一个浏览器窗口中的DOM顺序是:window- >(navigator,screen,history,location,document)
5.得到表单中元素的名称和值:document.getElementById( "表单中元素的ID").name(value)
6.一个小写转大写的JS: document.getElementById( "output ").value = document.getElementById( "input ").value.toUpperCase();
7.JS中的值类型:String,Number,Boolean,Null,Object,Function
8.JS中的字符型转换成数值型:parseInt(),parseFloat()
9.JS中的数字转换成字符型:( " "变量)
10.JS中的取字符串长度是:(length)
11.JS中的字符与字符相连接使用號.
12.JS中的比较操作符有:==等于,!=不等于, >, >=, <. <=
13.JS中声明变量使用:var来进行声明
14.JS中的判定语句结构:if(condition){}else{}
15.JS中的循环结构:for([initial expression];[condition];[upadte expression]) {inside loop}
16.循环中止的命令是:break
17.JS中的函数定义:function functionName([parameter],...){statement[s]}
18.当文件中出现多个form表单时.可以用document.forms[0],document.forms[1]来代替.
19.窗口:打开窗口window.open(),关闭一个窗口:window.close(),窗口本身:self
20.状態栏的设置:window.status= "字符";
21.弹出提示信息:window.alert( "字符");
22.弹出確认框:window.confirm();
23.弹出输入提示框:window.prompt();
24.指定当前显示链接的位置:window.location.href= "URL "
25.取出窗体中的所有表单的数量:document.forms.length
26.关闭文档的输出流:document.close();
27.字符串追加连接符: =
28.创建一个文档元素:document.createElement(),document.createTextNode()
29.得到元素的方法:document.getElementById()
30.设置表单中所有文本型的成员的值为空:
var form = window.document.forms[0]
for (var i = 0; i <form.elements.length;i ){
if (form.elements.type == "text "){
form.elements.value = " ";
}
}
31.复选按钮在JS中判定是否选中:document.forms[0].checkThis.checked (checked属性代表为是否选中返回TRUEFALSE)
32.单选按钮组(单选按钮的名称必须相同):取单选按钮组的长度document.forms[0].groupName.length
33.单选按钮组判定是否被选中也是用checked.
34.下拉列表框的值:document.forms[0].selectName.options[n].value (n有时用下拉列表框名称加上.selectedIndex来確定被选中的值)
35.字符串的定义:var myString = new String( "This is lightsword ");
36.字符串转成大写:string.toUpperCase();字符串转成小写:string.toLowerCase();
37.返回字符串2在字符串1中出现的位置:String1.indexOf( "String2 ")!=-1则说明没找到.
38.取字符串中指定位置的一个字符:StringA.charAt(9);
39.取出字符串中指定起点和终点的子字符串:stringA.substring(2,6);
40.数学函数:Math.PI(返回圆周率),Math.SQRT2(返回开方),Math.max(value1,value2)返回两个数中的最在值,Math.pow(value1,10)返回

value1的十次方,Math.round(value1)四舍五入函数,Math.floor(Math.random()*(n 1))返回隨机数
41.定义日期型变量:var today = new Date();
42.日期函数列表:dateObj.getTime()得到时间,dateObj.getYear()得到年份,dateObj.getFullYear()得到四位的年份,dateObj.getMonth()

到月份,dateObj.getDate()得到日,dateObj.getDay()得到日期几,dateObj.getHours()得到小时,dateObj.getMinutes()得到

,dateObj.getSeconds()得到秒,dateObj.setTime(value)设置时间,dateObj.setYear(val)设置年,dateObj.setMonth(val)设置

,dateObj.setDate(val)设置日,dateObj.setDay(val)设置星期几,dateObj.setHours设置小时,dateObj.setMinutes(val)设置

,dateObj.setSeconds(val)设置秒[注重:此日期时间从0开始计]
43.FRAME的表示方式: [window.]frames[n].ObjFuncVarName,frames[ "frameName "].ObjFuncVarName,frameName.ObjFuncVarName
44.parent代表父亲对象,top代表最顶端对象
45.打开子窗口的父窗口为:opener
46.表示当前所属的位置:this
47.当在超链接中调用JS函数时用:(javascript :)来开头后面加函数名
48.在老的浏览器中不执行此JS: ><!-- //-- >
49.引用一个文件式的JS: <script type= "text/javascript " src= "aaa.js " > </script >
50.指定在不支持脚本的浏览器显示的HTML: <noscript > </noscript >
51.当超链和onCLICK事件都有时,则老版本的浏览器转向a.html,否则转向b.html.:dfsadf
52.JS的內建对象

:Array,Boolean,Date,Error,EvalError,Function,Math,Number,Object,
RangeError,ReferenceError,RegExp,String,SyntaxError,TypeErr


or,URIError
53.JS中的换行:\n
54.窗口全屏大小: <script >function fullScreen(){ this.moveTo

(0,0);this.outerWidth=screen.availWidth;this.outerHeight=screen.availHeight;}window.maximize=fullScreen; </script >
55.JS中的all代表其下层的全部元素
56.JS中的焦点顺序:document.getElementByid( "表单元素").tabIndex = 1
57.innerHTML的值是表单元素的值:
"how areyou"

,innerHTML的值就是:how are </span></strong></span></span>you</strong></span></span>
</strong></span></span>2. 58.innerTEXT的值和上面的一样,只不过不会把</span></strong></span></span>这种標记显示出来.</span></strong></span></span>
</strong></span></span>59.contentEditable可设置元素是否可被修改,isContentEditable返回是否可修改的状態.</span></strong></span></span>
</strong></span></span>60.isDisabled判定是否为禁止状態.disabled设置禁止状態</span></strong></span></span>
</strong></span></span>61.length取得长度,返回整型数值</span></strong></span></span>
</strong></span></span>62.addBehavior()是一种JS调用的外部函数文件其扩展名为.htc</span></strong></span></span>
</strong></span></span>63.window.focus()使当前的窗口在所有窗口之前.</span></strong></span></span>
</strong></span></span>64.blur()指失去焦点.FOCUS()相反.</span></strong></span></span>
</strong></span></span>65.select()指元素为选中状態.</span></strong></span></span>
</strong></span></span>66.防止用户对文本框中输入文本:</span></strong></span></span>
</strong></span></span>67.取出该元素在页面中出现的数量:document.all.tags( "div(或其它HTML標记符) ").length </span></strong></span></span>
</strong></span></span>68.JS中分为两种窗体输出:模態和非模態.window.showModaldialog(),window.showModeless()</span></strong></span></span>
</strong></span></span>69.状態栏文字的设置:window.status= '文字',默认的状態栏文字设置:window.defaultStatus = '文字. ';</span></strong></span></span>
</strong></span></span>70.添加到收藏夹:external.AddFavorite( "http://www.dannyg.com ";, "jaskdlf "); </span></strong></span></span>
</strong></span></span>71.JS中碰到脚本错误时不做任何操作:window.onerror = doNothing;指定错误句柄的语法为:window.onerror = handleError;</span></strong></span></span>
</strong></span></span>72.JS中指定当前打开窗口的父窗口:window.opener,支持opener.opener...的多重继续.</span></strong></span></span>
</strong></span></span>73.JS中的self指的是当前的窗口</span></strong></span></span>
</strong></span></span>74.JS中状態栏显示內容:window.status= "內容" </span></strong></span></span>
</strong></span></span>75.JS中的top指的是框架集中最顶层的框架</span></strong></span></span>
</strong></span></span>76.JS中关闭当前的窗口:window.close();</span></strong></span></span>
</strong></span></span>77.JS中提出是否確认的框:if(confirm( "Are you sure? ")){alert( "ok ");}else{alert( "Not Ok ");} </span></strong></span></span>
</strong></span></span>78.JS中的窗口重定向:window.navigate( "http://www.sina.com.cn ";);</span></strong></span></span>
</strong></span></span>79.JS中的打印:window.print()</span></strong></span></span>
</strong></span></span>80.JS中的提示输入框:window.prompt( "message ", "defaultReply ");</span></strong></span></span>
</strong></span></span>81.JS中的窗口滚动条:window.scroll(x,y)</span></strong></span></span>
</strong></span></span>82.JS中的窗口滚动到位置:window.scrollby</span></strong></span></span>
</strong></span></span>83.JS中设置时间间隔:setInterval( "expr ",msecDelay)setInterval(funcRef,msecDelay)setTimeout</span></strong></span></span>
</strong></span></span>84.JS中的模態显示在IE4,NN中不行:showModalDialog( "URL "[,arguments][,features]); </span></strong></span></span>
</strong></span></span>85.JS中的退出之前使用的句柄:function verifyClose(){event.returnValue= "we really like you and hope you will stay longer. ";}} </span></strong></span></span>
</strong></span></span>
</strong></span></span>window.=verifyClose;</strong></span></span>
</strong></span></span>86.当窗体第一次调用时使用的文件句柄:onload()</span></strong></span></span>
</strong></span></span>87.当窗体关闭时调用的文件句柄:onunload()</span></strong></span></span>
</strong></span></span>88.window.location的属性: protocol(http:),hostname(www.example.com),port(80),host(www.example.com:80),pathname</span></strong></span></span>
</strong></span></span>
</strong></span></span>( "/a/a.html "),hash( "#giantGizmo ",指跳转到相应的锚记),href(全部的信息)</span></strong></span></span>
</strong></span></span>89.window.location.reload()刷新当前页面.</span></strong></span></span>
</strong></span></span>90.window.history.back()返回上一页,window.history.forward()返回下一页,window.history.go(返回第几页,也可以使用访问过的URL)</span></strong></span></span>
</strong></span></span>91.document.write()不换行的输出,document.writeln()换行输出</span></strong></span></span>
</strong></span></span>92.document.body.noWrap=true;防止链接文字折行.</span></strong></span></span>
</strong></span></span>93.变量名.charAt(第几位),取该变量的第几位的字符.</span></strong></span></span>
</strong></span></span>94. "abc ".charCodeAt(第几个),返回第几个字符的ASCii码值.</span></strong></span></span>
</strong></span></span>95.字符串连接:string.concat(string2),或用=进行连接</span></strong></span></span>
</strong></span></span>96.变量.indexOf( "字符",起始位置),返回第一个出现的位置(0开始计算)</span></strong></span></span>
</strong></span></span>97.string.lastIndexOf(searchString[,startIndex])最后一次出现的位置.</span></strong></span></span>
</strong></span></span>98.string.match(regExpression),判定字符是否匹配.</span></strong></span></span>
</strong></span></span>99.string.replace(regExpression,replaceString)替换现有字符串.</span></strong></span></span>
</strong></span></span>100.string.split(分隔符)返回一个数组存储值.</span></strong></span></span>
</strong></span></span>101.string.substr(start[,length])取从第几位到指定长度的字符串.</span></strong></span></span>
</strong></span></span>102.string.toLowerCase()使字符串全部变为小写.</span></strong></span></span>
</strong></span></span>103.string.toUpperCase()使全部字符变为大写.</span></strong></span></span>
</strong></span></span>104.parseInt(string[,radix(代表进制)])强制转换成整型.</span></strong></span></span>
</strong></span></span>105.parseFloat(string[,radix])强制转换成浮点型.</span></strong></span></span>
</strong></span></span>106.isNaN(变量):测试是否为数值型.</span></strong></span></span>
</strong></span></span>107.定义常量的要害字:const,定义变量的要害字:varv</span></strong></span></span>

来自:http://blog.csdn.net/zdrjlamp/article/details/7990450