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js debugging tool console.log() method to view the execution of js code_javascript skills
js debugging tool console.log() method to view the execution of js code_javascript skills
When I was debugging the code before, I usually checked the execution of the js code by using alert in the code block. Today I also saw a friend using the console.log function to print the output. Functions, variables, objects, the usage of console.log is recorded below. The specific syntax is:
console.log("值为:",fn);console.log() can output variables, functions, arrays, objects, etc.
<html>
<head>
<title>this关键字_函数调用</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("对象的值为：",test1);//对象的值为：<input type="text" id="test1" name="firstname" value="" />
},
'lastname': function() {
document.getElementById('lastname').value = "ying";
}
};
console.log(testobj);/** 打印对像**/
testobj.firstname();
testobj.lastname();
</script>
</html>
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