实用js代码片段【一】

表单验证

获取单选值

function getSex(){
   var value="";
   var radio=document.getElementsByName("gender");
   for(var i=0;i<radio.length;i++){
    if(radio[i].checked==true){
        value=radio[i].value;
        break;
    }
  }
  alert(value);
}

过滤数字,自符

window.onload=function (){
	var id=document.getElementById('id');
    var clearNumber=function (tThis){
    	var _v=tThis.value;
        tThis.value=_v.replace(/\D/g,"");  //过滤数字
        tThis.value=_v.replace(/[^\u4e00-\u9fa5]/g,"");  //过滤中文
    }
   txt.onblur = function(){
        clearNumber(this);
   }
   txt.onfocus = function(){
        clearNumber(this);
   }
   txt.onkeyup = function(){
        clearNumber(this);
   }
}

限制用户输入的字符数

window.onload=function (){
    var id=document.getElementById("id");
    clearmaxlength=function (tThis){  
        var _v=tThis.value,
            _vLen=_v.length,
            dataLen=tThis.getAttribute('data-length'),
            subLen=dataLen;
            if(_vLen>dataLen) tThis.value=_v.substr(0,subLen);
    }
    txt.onblur = function(){
        clearmaxlength(this);
    }
    txt.onfocus = function(){
        clearmaxlength(this);
    }
    txt.onkeyup = function(){
        clearmaxlength(this);
    }
}

回车提交

window.onload=function (){
    var txt=document.getElementById("txt");
    txt.onkeyup=function (e){
        e= e || window.event;
        var keycode=e.keyCode || e.which || e.charCode;
        if(keycode===13){
            alert("回车提交成功！")
        }
    }
}

关键字过滤

window.onload=function (){
    var txtfilter=document.getElementById("id");
    txtfilter.onclick=function (){
        words=[
            "JavaScript",
            "美女",
            /[外]{1}.{0,3}[挂]{1}/
        ],
        txtLen=words.length;
        for(var i=0;i<txtLen;i++){
            txtfilter.value=txtfilter.value.replace(words[i],"***");
        }
    }
}

未完待续。。。

当然，你也可以查看这里。

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