Javascript if语句不起作用 [英] Javascript if statements not working

问题描述

非常直接我想做的事情：

Pretty straight-forward what I want to do:

• 如果输入是 0 ，这意味着他们没有输入数字而且
  应该告诉你。


• 当输入 7 ，应该说你做对了。


• 还有别的，它应该告诉你你弄错了。

• If the input is 0, it means that they didn't input a number and it should tell you so.
• When the input is 7, it should say that you got it right.
• Anything else, it should tell you that you got it wrong.

但无论输入是什么，它只输出7是正确的线，我无法弄清楚出了什么问题。

But it just outputs the "7 is correct" line no matter what the input is, and I can't figure it out what is wrong.

<script type="text/javascript">
function problem2 ()
{
var number = 0;
var text=document.getElementById("output");
number = prompt("Enter a number between 1 and 10 please" , 0);
if (number = 0)
    {
     text.value = "You didn't enter a number!";
    }
if (number = 7)
    {
     text.value = "7 is correct!";
    }
else
    {
     text.value = "Sorry, ", input, "is not correct!";
    }
}
</script>
<input type="button" value="Click here" onclick="problem2()">
<input id="output" type="text">

推荐答案

您正在使用进行分配= 。使用 == 或 === 。

if( 0 == number ){

  text.value = "You didn't enter a number!";
}

另外，要小心你的支撑位置。 Javascript喜欢自动添加分号到行尾。 来源。

Also, be wary of your brace placement. Javascript likes to automatically add semicolons to the end of lines. Source.

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