Question

它只显示if语句。没有达到第二或第三个声明。 HTML部分仅显示“commentE”值。

var totalAmount = (conversion * sAmount);
totalAmount = $("#totalAmount").val(totalAmount);

var myadvice;
myadvice = $("#myadvice").val();

var great;
great = localStorage.getItem("great");

var commentE;
commentE = localStorage.getItem("commentE");

var between;
between = localStorage.getItem("between");

var betweenb;
betweenb = localStorage.getItem("betweenb");

var commentB;
commentB = localStorage.getItem("commentB");

var less;
less = localStorage.getItem("less");

var commentL;
commentL = localStorage.getItem("commentL");

if (totalAmount >= great) {
    myadvice = $("#myadvice").val(commentE);
} else if ((totalAmount >= between) && (totalAmount <= betweenb)) {
    myadvice = $("#myadvice").val(commentB);
} else if (totalAmount <= less) {
    myadvice = $("#myadvice").val(commentL);

这些是HTML部分（获取输入的索引页）

<div data-role="navbar">
    <ul>
        <li>
            <label for="between">Between</label>
            <div class="ui-grid-a">
                <div class="ui-block-a">
                    <input type="text" 
                        name="between" id="between" placeholder="between" value="200">
                </div>
                <div class="ui-block-b">
                    <input type="text" 
                        name="betweenb" id="betweenb" placeholder="between" value="499">
                 </div>
            </div>
        </li>
        <li>
            <label for="commentB">Comment</label>
            <input type="text" name="commentB" 
                id="commentB" placeholder="comments" value="OK">
        </li>
    </ul>
</div>

这些应该是结果（结果页面显示上一页的输入

    <div data-role="main" class="ui-content">
        <div class="ui-field-contain">
            <div data-role="fieldcontainer">
                <label for="advice"> My Advice is as follows: </label>
                <input type="text" name="advice" id="advice">
            </div>
        </div>
    </div>
</b>

Answer 1

如果else语句为executed in order，例如：

total = 10;
greater = 5;
between = 4;
if(total >= greater) {
  console.log("comment a");
} else if (total >= between) {
  console.log("comment b");
}

结果将为comment a，因为在total >= greater之前尝试了total >= between。这两个语句都是正确的，但第一个语句是首先尝试的，并且只执行一个语句的内容。运行if else语句中的代码后，执行的下一个操作将在if else组之下。

Answer 2

你的代码就是各种各样的错误。

totalAmount = $("#totalAmount").val(totalAmount);

这将totalAmount设置为jQuery对象$("#totalAmount")
您可能希望将其设置为数字。

great = localStorage.getItem("great");

这对字符串很有帮助。也许"5"。
您可能想调用parseFloat将其解析为数字。

//so
if (totalAmount >= great) {
//means
if ($("#totalAmount") > "5") {

jQuery对象是否大于字符串？显然这是真的！所以你得到第一个if。

如果，否则if语句不起作用（仅显示if）

2 个答案: