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Home > Web Front-end > JS Tutorial > Detailed explanation of javascript implicit conversion

Detailed explanation of javascript implicit conversion

巴扎黑
Release： 2016-12-06 11:15:40
Original
1483 people have browsed it

Javascript is a must-learn technology for web front-end development. What I will share with you today is the basic knowledge of implicit conversion of javascript. I hope it can help everyone learn better.

Convert to Boolean type false

undefined->falSe

null->falSe

numeric type 0 or 0.0 or NaN->falSe

String length is 0-> falSe

Other objects->true

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<html>

<head>

<meat charSet=”utf-8”>

<title></title>

<Script type=”text/javaScript”>

a=null;

a=0;

a=0.0;

a=0/0;//NaN

a=’’;

a=’0’;

a=’’;

If(a){

alert(‘真’);

} elSe{

Alert(’假’);

} 

</Script>

<body>

<隐式转换例子>

</body>

</html>

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Convert to numerical data

undefined->NaN

null->0

true->1|falSe->0

The content is a number->Number, otherwise it is converted to NaN

Other objects->NaN

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<html>

<head>

<meat charSet=”utf-8”>

<title></title>

<Script type=”text/javaScript”>

a=null;

a=0;

a=0.0;

a=0/0;//NaN

a=’’;

a=’0’;

a=’’;

If(a){

alert(‘真’);

} elSe{

Alert(’假’);

} 

var b=undefined；

b=null;

b=true;

b=falSe;

Var c=’12’;

c=’3king;

c=’true’;

c=’33’;

alert(typeof c);

c=c*1;

alert(typeof c);

</Script>

<body>

<隐式转换例子>

</body>

</html>

Copy after login

Converted to string data

undefined->"undefined"

null->"NaN"

true->"true" falSe->"falSe"

Numeric type->NaN, 0 or a string corresponding to a numerical value

Other objects->If this object exists, it is converted to the toString() method The value of

Related labels：
javascript
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