find the pattern in the string
ex:
"abcdef".indexof("bc");
2008年6月12日 星期四
getElementById
getElementById
get html element
ex:
html element:
input type="text", id="test", name="abc"
javascript:
document.getElementById("test").value
access data from value
math methods
NaN:
not a number
parseInt():
convert test to integer
ex:
parseInt("1");
parseFloat()
isNaN():
ex:
var a=3;
isNaN(a);
toFixed():
ex:
a=3.333;
a.toFixed(2);
---> a=3.33
variable , constant, function
variable:
ex:
var test=300;
constant:
ex:
const TEST= 300;
function:
ex:
function test() {
}
call two methods:
ex:
<body onload ="test(); test2();">
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