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  • javascript第七1节课

    window.open("http://www.baidu.com","_blank","width=300, height=200");

    进入百度。

    <script type="text/javascript">
    var content = "abc";
    console.log( content.replace("b", "q") );
    </script>

    把b转换成q。

    <script type="text/javascript">
    var arr = ["orange", "mango", "banana", "sugar", "tea"];
    console.log(arr);
    arr.splice(2, 0, "fish");

    2是第二个0是删除0个
    document.write(arr);
    document.write("<br/>");

    出结果(orange,mango,fish,banana,sugar,tea)

    arr.splice(5, 1);

    5是第五个1是删除1个
    document.write(arr);

    出结果(orange,mango,fish,banana,sugar)
    </script>

    <script type="text/javascript">
    var username = "a123456789";
    //设置只能输入多小个数字
    if( username.length > 7 ){
    alert("请输入正确的用户名...");
    }
    </script>

    <script type="text/javascript">
    var title = "出席二十国集团领导人杭州峰会系列活动纪实";
    document.write( title.substr(0, 10) + "...");

            看到1到10个字其余的用"..."表示。
    </script>

    <script type="text/javascript">
    var result = confirm("你确认删除?");
    console.log(result);
    if( result ){
    alert("正在删除中...");
    }else{
    alert("你取消了删除");
    }
    </script>

    <script type="text/javascript">
    var username = "a123456";
    console.log(username.charAt(0));
    for(var i = 0; i < username.length; i++) {
    document.write('<span class="font' + i + '">' + username.charAt(i) + "</span>");
    }
    </script>

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  • 原文地址:https://www.cnblogs.com/qq547372511/p/5851343.html
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