js全局函数escape、unescape、eval、isFinite、isNaN、Number、parseFloat、parseInt、String实例讲解

      <  type="text/ ">
        document.write(escape("http://www.cnblog.com/sql server/"))
      </ >

      <  type="text/ ">
        document.write(unescape("http%3A//www.cnblog.com/sql%20server/"))
      </ >

      <  type="text/ ">
        eval("document.write(2*3)");
        document.write('<br/>');
        var x=100;
        document.write(eval(x+100));    
      </ >

      <  type="text/ ">
        document.write(isFinite(311)+ "<br />")
        document.write(isFinite(-21.223)+ "<br />")
        document.write(isFinite(5)+ "<br />")
        document.write(isFinite(0)+ "<br />")
        document.write(isFinite("Hello world")+ "<br />")
      </ >

      <  type="text/ ">
        document.write(isNaN(311)+ "<br />")
        document.write(isNaN(-21.223)+ "<br />")
        document.write(isNaN(5)+ "<br />")
        document.write(isNaN(0)+ "<br />")
        document.write(isNaN("Hello world")+ "<br />")
      </ >

      <  type="text/ ">
        var test1= new Boolean(true);
        var test2= new Boolean(false);
        var test3= new Date();
        var test4= new String("555");
        var test5= new String("hello world");

        document.write(Number(test1)+ "<br />");
        document.write(Number(test2)+ "<br />");
        document.write(Number(test3)+ "<br />");
        document.write(Number(test4)+ "<br />");
        document.write(Number(test5)+ "<br />");
      </ >

      <  type="text/ ">
        document.write(parseFloat("10")+'<br/>') 
        document.write(parseFloat("10.010")+'<br/>') 
        document.write(parseFloat("10.334")+'<br/>') 
        document.write(parseFloat("34 45 66")+'<br/>') 
        document.write(parseFloat("fvx60.5 ")+'<br/>') 
        document.write(parseFloat("40.77sdada")+'<br/>')
      </ >

      <  type="text/ ">
        document.write(parseInt("10")+'<br/>') 
        document.write(parseInt("10.010")+'<br/>') 
        document.write(parseInt("10.334")+'<br/>') 
        document.write(parseInt("34 45 66")+'<br/>') 
        document.write(parseInt("fvx60.5 ")+'<br/>') 
        document.write(parseInt("40.77sdada")+'<br/>')
      </ >

      <  type="text/ ">
        var test1= new Boolean(1);
        var test2= new Boolean(0);
        var test3= new Boolean(true);
        var test4= new Boolean(false);
        var test5= new Date();
        var test6= new String("9992888");
        var test7= 2222;

        document.write(String(test1)+ "<br />");
        document.write(String(test2)+ "<br />");
        document.write(String(test3)+ "<br />");
        document.write(String(test4)+ "<br />");
        document.write(String(test5)+ "<br />");
        document.write(String(test6)+ "<br />");
        document.write(String(test7)+ "<br />");
      </ >