javascript手冊-i
2007-11-27 17:52:09 来源：WEB开发网 闂傚倸鍊搁崐鎼佸磹閹间礁纾归柟闂寸绾惧綊鏌熼梻瀵割槮缁惧墽鎳撻—鍐偓锝庝簻椤掋垺銇勯幇顖毿撻柟渚垮妼椤粓宕卞Δ鈧獮濠勭磽閸屾艾鈧懓顫濋妸鈺佺疅缂佸顑欓崥瀣煕椤愵偅绶氱紓鍐╂礋濮婂宕掑▎鎴М濠电姭鍋撻梺顒€绉甸幆鐐哄箹濞ｎ剙濡肩紒鎰殜閺屸€愁吋鎼粹€茬敖婵炴垶鎸哥粔鐢稿Φ閸曨垰鍐€妞ゆ劦婢€濞岊亪姊虹紒妯诲蔼闁稿海鏁诲濠氭晲婢跺﹤宓嗛梺缁樺姈缁佹挳宕戦幘璇叉嵍妞ゆ挻绋戞禍鐐叏濡厧浜鹃悗姘炬嫹
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index property
An integer representing the index of an option in a select object.
语法
selectName.options[indexValue].index
selectName is either the value of the NAME attribute of a select object or an element in the elements array.
indexValue is an integer representing an option in a select object.
Property of
options array
描述
The number identifying the position of the option in the selection, starting from zero.
相关
indexOf method
Returns the index within the calling string object of the first occurrence of the specified value, starting the search at fromIndex.
语法
stringName.indexOf(searchValue, [fromIndex])
stringName is any string or a property of an existing object.
searchValue is a string or a property of an existing object, representing the value to search for.
fromIndex is the location within the calling string to start the search from. It can be any integer from 0 to stringName.length - 1 or a property of an existing object.
Method of
string
描述
Characters in a string are indexed from left to right. The index of the first character is 0, and the index of the last character is stringName.length - 1.
If you do not specify a value for fromIndex, JavaScript assumes 0 by default. If searchValue is not found, JavaScript returns -1.
例子
The following example uses indexOf and lastIndexOf to locate values in the string Brave new world.var anyString=Brave new world//Displays 8document.write(<P>The index of the first w from the beginning is + anyString.indexOf(w))//Displays 10document.write(<P>The index of the first w from the end is + anyString.lastIndexOf(w))//Displays 6document.write(<P>The index of new from the beginning is + anyString.indexOf(new))//Displays 6document.write(<P>The index of new from the end is + anyString.lastIndexOf(new))
相关
isNaN function
On Unix platforms, evaluates an argument to determine if it is NaN (not a number).
语法
isNaN(testValue)
testValue is the value you want to evaluate.
描述
The isNaN function is a built-in JavaScript function. It is not a method associated with any object, but is part of the language itself. isNaN is available on Unix platforms only.
On all platforms except Windows, the parseFloat and parseInt functions return NaN when they evaluate a value that is not a number. The NaN value is not a number in any radix. You can call the isNaN function to determine if the result of parseFloat or parseInt is NaN. If NaN is passed on to arithmetic operations, the operation results will also be NaN.
The isNaN function returns true or false.
例子
The following example evaluates floatValue to determine if it is a number, then calls a procedure accordingly.
floatValue=parseFloat(toFloat)if isNaN(floatValue) { notFloat()} else { isFloat()}相关
italics method
Causes a string to be italicized as if it were in an <I> tag.
语法
stringName.italics()
stringName is any string or a property of an existing object.
Method of
string
描述
Use the italics method with the write or writeln methods to format and display a string in a document.
例子
The following example uses string methods to change the formatting of a string:var worldString=Hello, worlddocument.write(worldString.blink())document.write(<P> + worldString.bold())document.write(<P> + worldString.italics())document.write(<P> + worldString.strike())
The previous example produces the same output as the following htm:
<BLINK>Hello, world</BLINK><P><B>Hello, world</B><P><I>Hello, world</I><P><STRIKE>Hello, world</STRIKE>
相关
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