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How to replace regular expressions in javascript

coldplay.xixiOriginal: 2021-04-09 14:16:575848browse

javascript正则表达式使用替换的方法：使用的是【replace()】方法，语法为【stringObject.replace(regexp,replacement)】。

本教程操作环境：windows7系统、javascript1.8.5版，DELL G3电脑。

javascript正则表达式使用替换的方法：

正则表达式替换使用的是replace()方法。Replace()方法是用一些字符途欢另一些字符

语法：

stringObject.replace(regexp,replacement)

如果 regexp 具有全局标志 g，那么 replace() 方法将替换所有匹配的子串。否则，它只替换第一个匹配子串。

replacement 可以是字符串，也可以是函数。如果它是字符串，那么没有匹配都将由字符串替换。但是 replacement 中的 $ 字符具有特定的含义。举例：

<script>
    //"5=a,6=b,7=c"换成"a=5,b=6,c=7"
    var str="5=a,6=b,7=c";
    str=str.replace(/(\d+)=(\w)/g,"$2=$1");
    console.log(str);
</script>

Instanceof

<!DOCTYPE html>
<html>
<head>
    <meta charset="UTF-8">
    <title></title>
</head>
<body>
<script>
    var str="abc";
    console.log(str instanceof Array);//判断变量的类型是否为数组
    var arr=[];
    console.log(arr instanceof  Array);
</script>
</body>
</html>

Location:

<!DOCTYPE html>
<html>
<head>
    <meta charset="UTF-8">
    <title></title>
</head>
<body>
<input type="button" value="按钮" id="btn"/>
<script>
    var btn=document.getElementById("btn");
    btn.onclick=function(){
        window.location.href="04键盘事件练习.html";//链接的位置
    }
</script>
</body>
</html>

Screen:

<!DOCTYPE html>
<html>
<head>
    <meta charset="UTF-8">
    <title></title>
</head>
<body>
<script>
    //获取屏幕的分辨率
    console.log(screen.width);
    console.log(screen.height);
    //获取屏幕的分辨率 除去任务栏之后
    console.log(screen.availHeight);
    console.log(screen.availWidth);
</script>
</body>
</html>

相关免费学习推荐：javascript（视频）

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