javascript 如何使用eval为动态变量赋值？
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How to assign a value to a dynamic variable using eval?
提问by juria_roberts
I got the dynamic variable name doing
我得到了动态变量名
varname = "data" + newid + "['" + name + "']";
I would like to assign a value to the dynamic variable. I tried this
我想为动态变量赋值。我试过这个
eval(varname) = value;
but it doesn't work. What do I need to do in order to assign a value to the dynamic variable?
但它不起作用。我需要做什么才能为动态变量赋值？
采纳答案by Jo?o Silva
var data1 = { a: 200 };
var newid = 1;
var name = "a";
var varname = "data"+newid+"['"+name+"']";
var value = 3;
eval(varname + "=" + value); // change data1['a'] from 200 to 3
Having said that, evalis evil. Are you really sure you need to use dynamic variables?
话虽如此，eval是邪恶的。你真的确定你需要使用动态变量吗？
回答by Quentin
Don't use eval. Don't use dynamic variables.
不要使用评估。不要使用动态变量。
If you have an unordered group of related data, store it in an object.
如果您有一组无序的相关数据，请将其存储在一个对象中。
var myData = {};
myData[ newid + name ] = value;
although it looks like you are dealing with a dynamic object so
虽然看起来你正在处理一个动态对象，所以
myData[ newid ] = myData[ newid ] || {};
myData[ newid ][ name ] = value;
