javascript或jquery:在一个警报中显示多个变量 [英] javascript or jquery: show multiple variables in one alert
问题描述
警告命令采用以下结构:
Alert command assumes this structure:
alert (variable)
如何在一个警报中显示多个变量?
How to show multiple variables in a single alert?
推荐答案
警告命令采用以下结构:
警报(变量)
不, alert()
假定这种结构:
alert(some expression)
...其中some expression几乎是任何JavaScript表达式 - 如果表达式是不是一个字符串,它将被转换(虽然在某些情况下,例如,对于某些对象,结果可能不是很有意义)。
...where "some expression" is pretty much any JavaScript expression - if the expression is not a string it will be converted (though in some cases, e.g., for some objects the result might not be very meaningful).
所以:
alert(variable);
alert("string literal");
alert(variable1 + variable2 + variable3);
alert(variable1 + ", " + variable2);
alert(resultOfFunctionCall());
alert([1,2,3]);
alert(whatever() + "else" + you.can.think + "of");
甚至:
alert(); // displays "undefined"
请注意,如果您尝试调试代码,最好使用 console.log()
than alert()
。如果您正在尝试生成动态消息以显示用户只需根据需要连接变量,例如:
Note that if you are trying to debug your code you are better off using console.log()
than alert()
. If you are trying to produce a dynamic message to show the user just concatenate variables as needed, e.g.:
alert("Hello there " + name + ". Welcome.");
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