javascript ѧϰ±Ê¼Ç£¨4£©
1. Ò»ÖÖÃæÏò¶ÔÏóÓïÑÔÐèÒª¿ª·¢ÕßÌṩÒÔÏÂËÄÖÖ»ù±¾ÄÜÁ¦¡£
£¨1£©·â×°---°ÑÏà¹ØÐÅÏ¢£¨ÎÞÂÛÊôÐÔ»¹ÊÇ·½·¨£©´æ´¢ÔÚ¶ÔÏóÖеÄÄÜÁ¦¡£
£¨2£©¾Û¼¯---°ÑÒ»¸ö¶ÔÏó´æ´¢ÔÚÁíÒ»¸ö¶ÔÏóÄÚµÄÄÜÁ¦¡£
£¨3£©¼Ì³Ð---ÓÉÁíÒ»¸öÀࣨ»ò¶à¸öÀࣩµÃÀ´ÀàµÄÊôÐÔ»ò·½·¨µÄÄÜÁ¦¡£
£¨4£©¶à̬---±àдÄÜÒÔ¶àÖÖ·½·¨ÔËÐеĺ¯Êý»ò·½·¨µÄÄÜÁ¦¡£
2. °Ñ¶ÔÏóµÄËùÓÐÒýÓö¼ÉèÖÃΪ null£¬¿ÉÒÔÇ¿ÖÆÐԵķϳý¶ÔÏ󡣷ϳý¶ÔÏóºÍËüµÄÊôÐÔÊÇÈ·±£ÄÚ´æÕýȷʹÓõÄÓÐЧ·½·¨.
var oTest = new Object();
oTest = null;
3. ¿ÉÒÔÓÃ×ÖÃæÁ¿±íʾ¶¨Òå Array ¶ÔÏó
var test = ["1","2","3"];
alert(test.length); //outputs "3"
test[25] = "5";
alert(test.length); //outputs "26"
4. Array ¶ÔÏóµÄ¶¯×÷¾ÍÏñÒ»¸öÕ»,×ñѺó½øÏȳö(LIFO)ÔÔò.
var test = new Array();
test.push("1");
test.push("2");
test.push("3");
alert(test.toString()); //outputs "1,2,3"
testI = test.pop();
alert(testI); //outputs "3"
alert(test.toString()); //outputs "1,2"
¸ù¾ÝÕâ¸öÔÔòÉè¼ÆµÄÒ»¸ö·´×ªÊý×é,²»¹ýЧÂʺܵÍ:
function fChange(fArray) {
var nArray = new Array();
var fLength = fArray.length;
for(var i=0;i<fLength;i++){
nArray[i] = fArray.pop();
}
alert(nArray.toString());
}
var aString = new String("e,a,l,c,u,b");
var aArray = aString.split(",");
fChange(aArray); //outputs "b,u,c,l,a,e"
ÔÀ´»¹ÓÐÒѾ¶¨ÒåºÃµÄ·½·¨,reverse().
var aString = new String("e,a,l,c,u,b");
var aArray = aString.split(",");
var tArray = aArray.reverse();
alert(tArray.toString());
ÁíÍâÒ»ÖÖÊÇ°´ÕÕÊý×éµÄÖµµÄÉýÐòÅÅÁÐ
var aString = new String("e,a,l,c,u,b");
var aArray = aString.split(",");
var tArray = aArray.sort();
alert(tArray.toString()); //outputs "a,b,c,e,l,u"
5. ¿ÉÒÔÓà prototype ÊôÐÔΪÈκÎÒÑÓеÄÀඨÒåз½·¨.Èç¹ûҪΪÿһ¸ö±¾µØ¶ÔÏóÌí¼Óз½·¨,¾Í±ØÐëÔÚObject¶ÔÏóµÄ prototype ÊôÐÔÉ϶¨ÒåËü.
Object.prototype.showValue = function(){
alert(this.valueOf());
}
var test
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{
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