The js debugging tool console.log of method looks at the execution of the js code

2020-03-30 03:38:35
OfStack

When I was debugging the code, I usually used alert in the code block to check the execution of js code. Today, I also saw some friends use the console.log function to print out functions, variables and objects.


console.log(" A value of :",fn);

Console.log () can output variables, functions, arrays, objects, and more


<html> 
<head> 
<title>this The keyword _ A function call </title> 
<meta http-equiv="Content-Type" content="text/html; charset=gb2312"></head> 
<body> 

<input type="text" id="test1" name="firstname" value="" /> 
<input type="text" id='lastname' name='lastname' value=''> 

</body> 

<script type="text/javascript"> 
var testobj = 
{ 
'id': 1, 
'content': 'test', 
'firstname': function() { 
var EleFirst= document.getElementById('test1'); 
//document.getElementById('firstname').value = "zhang"; 
//document.getElementById("test1").value = this.content; 
//document.getElementById("test1").setAttribute("value","zhang"); 
//this.content = val; 
EleFirst.setAttribute("value",this.content); 
console.log(" The value of the object is: ",test1);//The value of the object is: <Input type="text" id="test1" name="firstname" value="" />
}, 
'lastname': function() { 
document.getElementById('lastname').value = "ying"; 
} 
}; 
console.log(testobj); 

testobj.firstname(); 
testobj.lastname(); 
</script> 
</html>