Extjs3常用基础方法使用详解

/**

* Extjs3.4常用基础方法使用

*/

Ext.onReady(function(){

/*var colorsArray=new Array();

colorsArray[0]='Blue';

colorsArray[1]='Red';

colorsArray[2]='White';

var colorsArrayType=Ext.type(colorsArray);

// colorsArrayType’s value is “array”.

document.writeln(colorsArrayType);

var isArray=Ext.isArray(colorsArray);

//isArray is true

document.writeln(isArray);

//position is 2, the index of 'White' in the array.

var position=colorsArray.indexOf('White');

document.write(position+"<br>");

// 'Brown' does not exist in the array,

// position is -1. 不存在返回-1，存在返回索引值

position=colorsArray.indexOf('Brown');

document.write(position+"<br>");

//remove one from a array

colorsArray.remove('Blue');

position=colorsArray.indexOf('Blue');

// 'Blue' does not exist anymore,

// position is -1.

document.write(position+"<br>")；

var colorsObject={color1:'Blue',color2:'Red',color3: 'White'};

var colorsObjectType=Ext.type(colorsObject);

document.write(colorsObjectType);//colorsObjectType's value is "Ojbect"

var aNumber=1;

var aString='1';

//Ext.num：验证某个值是否数字的一个辅助方法，若不是，返回指定的缺省值

// number is 1.

var number=Ext.num(aNumber,0);

document.write(number);

//不是数字，返回指定默认值

number=Ext.num(aString,0);

document.writeln(number);

//converting empty references to a default value;

//验证值是否非空、非null、非undefined、非空白字符的便捷方法

var empty;

var notEmpty=Ext.value(empty,'defaultValue',false);

//// notEmpty is 'defaultValue'

document.writeln(notEmpty);

var sample;

var defined=Ext.util.Format.undef(sample+'define is an empty string<br/>');

document.write(defined);

// defined is now "sample is now defined".

sample = "sample is now defined";

defined = Ext.util.Format.undef(sample);

document.write(defined + '<br/>');*/

/*

var needsEscape = "ExtJS's String Class will escape this";

//escape方法对‘进行转移为\'

var escaped = String.escape(needsEscape);

document.write(escaped+'<br>');



var sort='ASC';

sort=sort.toggle('ASC','DESC');

document.write(sort);



var sample = "some text";

var converted=Ext.util.Format.uppercase(sample);

// converted is now "SOME TEXT".

document.write(converted+'<br>');

sample = "SOME TEXT";

converted=Ext.util.Format.lowercase(sample);

document.write(converted+'<br>');*/





var number1 = 20;

var number2 = 72;

//constrain输出在木个范围的值,就输出最小值或最大值

var constrained = number1.constrain(25, 50);

document.write(constrained+"<br>");

var constraineds = number2.constrain(25, 50);



document.write(constraineds+"<br>");

}

);