jquery小技巧

Posted 2020-06-17

1) 禁用鼠标右键单击

　　jQuery程序员可以使用此代码在网页上禁用鼠标右键点击。

    $(document).ready(function() {
        //catch the right-click context menu
        $(document).bind("contextmenu",function(e) {                
            //warning prompt - optional
            alert("No right-clicking!");
     
            //delete the default context menu
            return false;
        });
    });

2) 利用jQuery调整文字大小

　　使用此代码，用户可以重新网站上文字的大小（增大和减少）

    $(document).ready(function() {
        //find the current font size
        var originalFontSize = $(‘html‘).css(‘font-size‘);
     
        //Increase the text size
        $(".increaseFont").click(function() {
            var currentFontSize = $(‘html‘).css(‘font-size‘);
            var currentFontSizeNumber = parseFloat(currentFontSize, 10);
     
            var newFontSize = currentFontSizeNumber*1.2;
            $(‘html‘).css(‘font-size‘, newFontSize);
            return false;
        });
     
        //Decrease the Text Size
        $(".decreaseFont").click(function() {
            var currentFontSize = $(‘html‘).css(‘font-size‘);
            var currentFontSizeNum = parseFloat(currentFontSize, 10);
     
            var newFontSize = currentFontSizeNum*0.8;
            $(‘html‘).css(‘font-size‘, newFontSize);
            return false;
        });
     
        // Reset Font Size
        $(".resetFont").click(function(){
        $(‘html‘).css(‘font-size‘, originalFontSize);
      });
    });
 
3) 在新的Windows打开链接

    $(document).ready(function() {
        //select all anchor tags that have http in the href
        //and apply the target=_blank
        $("a[href^=‘http‘]").attr(‘target‘,‘_blank‘);
    });

 

4) Style Sheets Swap

    $(document).ready(function() {
        $("a.cssSwap").click(function() {
            //swap the link rel attribute with the value in the rel   
            $(‘link[rel=stylesheet]‘).attr(‘href‘ , $(this).attr(‘rel‘)); 
        });
    });

 
5) 回到顶部链接
　  
    $(document).ready(function() {
        //when the id="top" link is clicked
        $(‘#top‘).click(function() {
            //scoll the page back to the top
            $(document).scrollTo(0,500);
        }
    });

6) 获取鼠标光标的x和y轴

    $().mousemove(function(e){
        //display the x and y axis values inside the P element
        $(‘p‘).html("X Axis : " + e.pageX + " | Y Axis " + e.pageY);
    });

7) 检测当前鼠标坐标

　　使用这个脚本，你可以在jQuery所支持的任何Web浏览器找到当前鼠标的坐标。代码如下：

    $(document).ready(function() {
    $().mousemove(function(e)
    {
    $(‘# MouseCoordinates ‘).html("X Axis Position = " + e.pageX + " and Y Axis Position = " + e.pageY);
    });
    });

 
8) 在jQuery中预加载图片

　　此图像预加载的脚本有助于非常快速加载图像或网页。你不必等待图像加载。代码：

    jQuery.preloadImagesInWebPage = function()
    {
         for(var ctr = 0; ctr<arguments.length; ctr++)
    {
    jQuery("<img alt="">").attr("src", arguments[ctr]);
    }
    }

To use the above method, you can use the following piece of code:

    $.preloadImages("image1.gif", "image2.gif", "image3.gif");


To check whether an image has been loaded, you can use the following piece of code:

    $(‘#imageObject‘).attr(‘src‘, ‘image1.gif‘).load(function() {
    alert(‘The image has been loaded…‘);
    });