php - PHP 中的 JavaScript

Question

我正在尝试在 jquery 中执行以下操作

<?php

    echo "<script>";
    echo "$(document).ready(function(){";
    echo "$('#mainbody-wrapper').removeClass('mainbody-wrapper')";
    echo ";";
    echo "$('#mainbody-wrapper').addClass('newStyle')";

    echo ";";
    echo "contentHeight=$('.content').css('height') + 20";
    echo ";";

    echo "alert(contentHeight)";
    echo ";";
    echo "$('#mainbody-wrapper').css('height',contentHeight)";
    echo ";";
    echo "$('#subcontent-wrapper').remove()";
    echo ";";
    echo "})";
    echo "</script>";

？>

但是变量contentHeight输出300px20。我想做 javascript 添加，但它被串联起来。如何实现这一目标？

Answer 1

如果你只是想读取高度，jquery 有 height方法

echo "contentHeight=$('.content').height() + 20";

来自文档:

The difference between .css('height') and .height() is that the latter returns a unit-less pixel value (for example, 400) while the former returns a value with units intact (for example, 400px). The .height() method is recommended when an element's height needs to be used in a mathematical calculation.