问题
var params = {a:1,b:2};
var str = '<a href="#" onclick="doSomething('+params+')">aaaa</a>';
document.write(str);
when I click the <a> on the page,it throws "Uncaught SyntaxError: Unexpected identifier".I can't understand.
回答1:
The reason is that when you use string concatenation, params is casted to string, as result you get something like [object Object] in parenthesis.
You should better put params as var params = '{a:1,b:2}';.
Upd.
As suggested in comments, another viable approach is using JSON.stringify:
var params = {a:1,b:2};
var str = '<a href="#" onclick="doSomething('
+ JSON.stringify(params)
+ ')">aaaa</a>';
document.write(str);
Please, pay attention that JSON.stringify may not be supported by older browsers and you'll need to include additional libraries to make them work.
回答2:
[object Object] is the string representation of any JavaScript object. In your scenario you have params concatenated with a string, which will cast any variable type to a string.
回答3:
The in your case str looks like this:
<a href="#" onclick="doSomething([object Object])">aaaa</a>
As you can see, that is not what you want.
回答4:
The answer by Li0liQ is quite Ok. When you clicking on that link you can find doSomething[object Object]
This is only object required .You are not writing the params into document. Casting Problem.
回答5:
Ran into same issue. Reason for the issue: params is converted to string 'object Object' when html is rendered.
The problem can be sorted out in two ways:
Approach 1: add a click handler to the js code. Refer add click handler
Approach 2: Say I want to pass a JSON object named 'params' to the onclick function. As I need a very few attributes of the 'params' object, instead of adding a new handler as in 1st approach, I would rather just pass those specific parameters as below:
'<a href="#" onclick="doSomething(\'' + params['attribute1'] + '\'\, \'' +params['attribute2'] + '\'\)">aaa</a>'
来源：https://stackoverflow.com/questions/11753245/onclick-dosomethingobject-object-uncaught-syntaxerror-unexpected-identifi