JavaScript 学习_1

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JavaScript 学习_1

2019年11月24日 ⁄ web前端 ⁄ 共 5044字 ⁄ 字号小中大 ⁄ 评论关闭

JavaScript 学习_1

学习过程的代码集.

<html>
<head>
<title>**zczhu,learn javaScript</title>
<script language = "JavaScript">
document.write("Welcome to javascript learn");
count = 100;
document.write(" count = ",count);
mParseInt = "100pstr" ;
document.write(" mParseInt = ", mParseInt);
document.write(" mParseInt(10) = ", parseInt(mParseInt));
document.write(" mParseInt(8) = ", parseInt(mParseInt,8));
document.write(" mParseInt(16)= ", parseInt(mParseInt,16));
mParseInt = "100.2pstr中";
document.write(" mParseFloat = ", mParseInt);
document.write(" mParseFloat(10) = ", parseFloat(mParseInt));
document.write(" type is: ",typeof(x));
document.write(" type is: ",typeof(x)==undefined);
document.write(" type is: "+typeof(x));
document.write(" variable count type is: "+typeof(count));
document.write(" variable mParseInt type is: "+typeof(mParseInt));
var myint = 100;
var mystring = "68";
var mybool = true;
var myaddress = "号";
document.write(" myint = ",myint," mystring = ", mystring);
result1 = myint + mystring;
document.write(" myint + mystring = ", result1);
result2 = myint + parseInt(mystring);
document.write(" myint + parseInt(mystring) = ", result2);
document.write(" mybool = ", mybool);
result3 = myint + mybool;
document.write(" myint + mybool = ", result3);
result4 = mystring + mybool;
document.write(" mystring + mybool = ", result4);
document.write(" myaddress = ", myaddress);
result5 = myint + myint + myaddress;
document.write(" myint + myint + myaddress = ", result5);
result6 = "" + myint + myint + myaddress;
document.write(" + myint + myint + myaddress = ", result6);
var x;
x = prompt("please input x value:", "");
if(x>0)
{
document.write(" x是正数");
}
else
{
document.write(" x是负数或者为0");
}
x = parseInt(x);
if(x>0)
{
document.write(" x的绝对值是：",x);
}
else
{
document.write(" x的绝对值是：",-x);
}
setBgColor();
function setBgColor()
{
with(document)
{
bgColor = "pink";
fgColor = "blue";
write("背景是粉红色，前景（文字）是蓝色的");
}
}
var iarr = new Array(1,2,3);
document.write(" iarr array is :", iarr);
document.write(" eval(5 == 6)",eval(5 == 6));
document.write("*************Function define and call*****************");
function funcA()
{
var stringA = "This is function funcA define variable";
funcB();
function funcB()
{
var stringB = "This is function funcB define variable";
document.write(" function B variable: ", stringB);
document.write(" function A variable in funcB call", stringA);
}
}
document.write(" Call funcA follow:");
funcA();
document.write(" Call funcA over");
document.write("************* Function define and call 递归函数*****************");
function f(n)
{
document.write("调用发f(",n,") ");
if(n==1)
{
return 1;
}
else
{
return f(n-1)+n;
}
}
document.write("f(10)的值为：", f(10));
document.write(" *************Extended Regular Expressions*****************");
document.write(" *************'var varname = /pattern/flags' *****************");
document.write(" *************flag: I－>忽略大小写，即进行字符串匹配时候。g－>全局匹配。 m－>进行多行匹配****");
var language = new RegExp("JavaScript", "ig");
var name = new RegExp("zzc");
var Date = new RegExp("1984");
var mymatch = new Array();
var str = "JavaScript is powerful and javascript is very easy!";
var regxp = /javascript/ig;
mymatch = str.match(regxp);
document.write(" 最近一次匹配的字符串为：" + RegExp.input + " ");
document.write("匹配的字符串的个数为：" + mymatch.length + " ");
for(i = 0; i<mymatch.length; i++)
{
document.write("第"+i+"个匹配字符串为：" + mymatch[i]+ " ");
}
document.write(" 最近一次搜索的开始位置为：" + RegExp.index + " ");
document.write("下次搜索的开始位置为：" + RegExp.lastIndex + " ");
document.write("最近一次匹配的字符串前面的字串为：" + RegExp.leftContext + " ");
document.write("最近一次匹配的字符串后面的字串为：" + RegExp.rightContext + " ");
document.write(" *************Replace()***************** ");
document.write("替换前的字符串为：" + str + " ");
var afterstr=str.replace(regxp, "JAVASCRIPT");
document.write("替换后的字符串为：" + afterstr + " ");
document.write(" *************search()***************** ");
str = "JavaScript基础与实践教程";
regxp = /实践/;
var iindex = str.search(regxp);
document.write("在字符串/'" + str +"/'的第" + iindex + "字符位置找到匹配模式" + regxp);
document.write(" 学习《JavaScript程序设计基础》此书到91页");
</script>
</head>
<html>

【上篇】JavaScript 学习_2
【下篇】Using multiple CGLayer objects to draw a flag

作者: inducing

该日志由 inducing 于4年前发表在web前端分类下，最后更新于 2019年11月24日.
转载请注明: JavaScript 学习_1 | 学步园 +复制链接

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JavaScript 学习_1

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