//逻辑运算
var intersection=true && (1>2);
document.write("true && (1>2):"+intersection+"</br>");
var union=true || (1>2);
document.write("true || (1>2):"+union+"</br>");
var not=!(1>2);
document.write("! (1>2):"+not+"</br>");
document.write("............................<br/>");
//条件运算
var condition=(3>5)?"你":"我";
document.write('(3>5)? "你" : "我": '+condition+"</br>");
document.write("............................<br/>");
//字符串转数字
var a = Number("2018") + 1000;
document.write(a+"</br>");
document.write("Number('123'):" + Number("123") + "<br/>");
document.write("Number('3.1415'):" + Number("3.1415") + "<br/>");
document.write("Number('hao123'):" + Number("hao123") + "<br/>");
document.write("Number('100px'):" + Number("100px") + "<br/>");
//parseInt()提取的是整数部分,parseFloat()不仅会提取整数部分,还会提取小数部分。
document.write("parseInt('123'):" + parseInt("123") + "<br/>");
document.write("parseInt('3.1415'):" + parseInt("3.1415") + "<br/>");
document.write("parseInt('hao123'):" + parseInt("hao123") + "<br/>");
document.write("parseInt('100px'):" + parseInt("100px") + "<br/>");
document.write("............................<br/>");
//数字转字符串:(1)与空字符串相加(2)toString()
var a = 2018 + "";
var b = a + 1000;
document.write(b+"</br>");
var a = 2018;
var b = a.toString() + 1000;
document.write(b+"</br>");
document.write("............................<br/>");
//转义字符
//(1)如果是在document.write()中换行,则应该用:<br/>
//(2)如果是在alert()中换行,则应该用:\n
//\':英文单引号; /":英文双引号
document.write("绿叶,给你\"初恋\"般的感觉~");
console