javascript技巧集合

1.判断输入是否为中文的函数

 function ischinese(s){
var ret=true;
for(var i=0;i<s.length;i++)
ret=ret && (s.charCodeAt(i)>=10000);
return ret;
}

2.改进的email检查js脚本

function isEmail(str)
{
// are regular expressions supported?
var supported = 0;
if (window.RegExp) {
var tempStr = "a";
var tempReg = new RegExp(tempStr);
if (tempReg.test(tempStr)) supported = 1;
}
if (!supported)
return (str.indexOf(".") > 2) && (str.indexOf("@") > 0);
var r1 = new RegExp("(@.*@)|(//.//.)|(@//.)|(^//.)");
var r2 = new RegExp("^.+//@(//[?)][a-zA-Z0-9//-//.]+//.([a-zA-Z]{2,3}|[0-9]{1,3})(//]?)$");
return (!r1.test(str) && r2.test(str));
}

3.屏蔽键盘上回车按键(无需调用)

        function document.onkeypress()
        {
            if(event.keyCode==13)
            {
             event.keyCode=0;
            }
        }

4.c#后台向前台输出内容时加换行

alert('内容//r//n');必须是2个//，正常的/r/n会报错.

5.javascript给dropdownlist控件赋值

                for (int j = 0; j < this.dropDWEI.Items.Count; j++)
                {
                    if (dt.Rows[i]["DWEI"].ToString() == this.dropDWEI.Items[j].Value)
                    {
                        this.dropDWEI.Items[j].Selected = true;
                    }
                }