JavaScript dynamically judges html elements and performs different operations

In order to perform different operations on different elements in javascript, it is necessary to judge the elements that trigger the event in javascript and then perform different operations.

example:

html

Copy the codeThe code is as follows:

 
<input type='button' name='updatemetal' value='modify' onclick='getmetalid(this)'>
<input type='button' name='deletemetal' value='delete' onclick='getmetalid(this)'>

javascript

Copy the codeThe code is as follows:

 
<script type="text/javascript"> 
function getmetalid(input) { 
metalid = ; 
if(("value") == 'Modify'){
damicsubmit(metalid); 
}else if(("value") == 'delete'){
damicsubmit2(metalid); 
} 
} 
</script> 

It was not successful to obtain the name and id attributes of the input, but the value is OK. I don't know why.

refer to:

Copy the codeThe code is as follows:

 
var obj=("div1").getElementsByTagName("textarea") 
for(var i=0;i<;i++) 
{ 
if(obj[i].id=="aa") 
{ 
alert(obj[i].innerText) 
} 
} 