escape,encodeURI,encodeURIComponent

var arr = [];
for(var i=0;i<256;i++) {
  var char=String.fromCharCode(i);
  if(encodeURI(char)!==encodeURIComponent(char)) {
    arr.push({
      character:char,
      encodeURI:encodeURI(char),
      encodeURIComponent:encodeURIComponent(char)
    });
  }
}
console.table(arr);

//对整个URL进行编码
encodeURI('http://xyz.com/?a=12&b=55'); 
// 编码参数
'http://xyz.com/?a=' + encodeURIComponent('酷&炫');